Just want to put my own 2 cents around this point. A Masters can be helpful, but it really depends on the circumstances and specifics of the work you do during your Masters. For example, if you just do all your coursework and a little data collection/analysis for your thesis, that is not really going to be significantly helpful for your chances of getting into a doctoral program.
If your end goal is a PhD, that is first and foremost a research degree and one of the most significant aspects of your application will be your research experience. Spending an extra year or two working as a research coordinator/assistant amassing experience that can be translated into something that will make you a better fit at the programs you apply to will be much more beneficial than a barebones Masters. Some other considerations, to my knowledge at least half of admitted applicants to programs tend to only have their Bachelors (a Masters is by no means necessary, nor is it some kind of automatic "advantage"). Most terminal Masters programs are not funded and will likely require taking out loans. Additionally, I've heard from mentors/peers that certain programs actually look down upon applicants who already have Masters degrees, as they'd prefer to train clinical students "ground up." I'm not sure how true this is, but worthy of mentioning at least.
Having said that, there are certainly situations where getting a Masters first would be more appropriate such as my own one. I had a (pardon my French) **** undergrad GPA, no real allusions to future goals, and limited research experience so pursuing a Masters just made sense. In addition to choosing a program that required an experimental thesis and defense, I also volunteered in research labs close to the specific interests I had accruing skills and experience that were instrumental in my admittance to a doctoral program.
Another point is to ask yourself what your end goal is. If it's to purely perform clinical work and see patients, there are other much shorter and cheaper paths out there than going for a doctorate. Just something to be aware of.