I commented before, and I've given a lot of thought lately to what advice I would give to myself if I had a time machine and could go back and offer advice to myself at an earlier stage in my academic career. I didn't consider this in relation to your post specifically, but have been asked for advice recently in person, and it got me thinking along those lines.
I've never regretted getting the medical lab science degree, nor working in the MLS field. Its a real job, and a decent paying job. In your situation, I would totally do it. Its the best way to make the most of what you have done thus far, and it helps you salvage something from your academic situation. So I've traveled some of the same ground as you, and know the terrain.
While its certainly possible for you to get into PA school, it will come after lot of hard work, and a lot of time. Your grades aren't awful, and you showed some good performance in a few. The big question that remains in my mind is what gets you to where you want to go in the most efficient manner possible, with the most certainty. I look at PA school these days as a crap shoot for anyone without a really consistent academic record, and I wonder how many people are really up for that reality. I've lived it, and it wasn't satisfying. I don't like the flow of the PA application process. I've watched friends of mine struggle several years in a row to get in to PA school, and the problem is that by the time you know if you are in or not, its too late to make a meaningful attempt to improve your academics for that year. You often don't get final word on where you stand until after January of the following year, and that's after you submit your application packet the previous summer. In the meantime, you have the option of doing nothing and waiting, or else pay money taking classes while you wait. If you do nothing, then you have little to no improvement to show for yourself for the year of waiting. That's how the process pans out. For me, I applied to nursing school alongside PA school, and had an acceptance to nursing school in hand before some PA schools even got back to me about interview offers. To this day, I've come to feel that my nursing degree opened up more doors for me than anything I've ever done academically, both financially and professionally. To do things over at any point in my education, I would advise myself to have obtained a nursing degree as quickly as possible. An accelerated BSN would have been the most helpful, but even my two year nursing degree was enough to put me on the track to become an NP quickly. I think I even lingered too long as an RN. I wouldn't bother with toiling to become a PA, nor would I even consider medicine, dental, or podiatry. But that's me. Psyche NP is what I've wanted to do for some time now, and my state is an NP independent practice state, so I have a lot of options.
What I think this would mean in your case for you is that I still would get that MLS degree because its a good checkpoint. You get it and you start working, and you can feed a family and live middle class while you plan your next step. That may mean making multiple attempts to get into PA school (which is what I think it will take for you to get to PA school, and even then that's a gamble for you). But another option is to gear up to do a one year accelerated BSN degree, then go on to NP school. Its a long time, and you are probably thinking that PA school could happen quickly and you'll be done in 2 years as opposed to something like close to 4 as an NP. But I think the thing that tips the scale in favor of NP is the uncertainty that you will have due to your grades. If your science GPA was 3.4, and your overall GPA was 3.4, I wouldn't suggest NP. With what you have right now, and even with some nudging up with some stellar grades this last semester, I still don't think you have a clear shot. You are stuck in a position where you are a risk for a PA school that is very risk averse with who they grant seats to. Nothing compels them to take those kinds of risks when they have 5 times more applicants that present a solid academic record that shows that they won't buckle under pressure. Each of those seats they give out is worth tens of thousands of dollars, or even a hundred thousand dollars. They make very safe picks for those positions.
People get tunnel vision when they set their sights on their chosen professional school. I applied to 10 PA schools and one RN school. I got interview invites at less than 4 PA schools and got into RN school. I'm really glad I went RN for a lot of reasons I won't go into here. I watched a friend apply and get rejected to PA school enough times that they could have gone through RN school and been an RN for a few years before that person landed in PA school. Along the way, as an RN, this person could have been making great money, and feeling a lot better about life.