First of all, ErinG, be very, very careful about deciding when and where you will conceive. It very, very rarely works out that well. You may well tempt fate too much and end up pregnant tomorrow, or taking years to conceive.
Second, you can absoutely have a baby in medical school, as long as you have the support you need (from your school and sig. other/family) THere are numerous women students who have had babies here over the past year and a half. Many took one semester off and/or joined the class behind them for clinicals, others, (one 3rd year and three 4th years) simply fit it into their rotations.
I suggest keeping in mind something mentioned before; don't expect anything to be "just the way you planned." You may plan on delivering a month after the boards, only to have your water break the night before, or plan on working through your pregnancy and end up so mentally and physically exhausted that you barely have enough energy to brush your teeth. On the same note, if you decide to take time off, you may end up sitting around twiddling your thumbs, anxious about all of the time you missed. For me, I worked full-time when I was pregnant with my son, then was essentially a SAHM during my second pregnancy (I'm one of those "can't-brush-my-teeth, I'm-so-exhausted" pregnant women) and I can tell you that my first pregnancy went much more smoothly because I was occupied (physically and mentally)
As for life after baby, just do what you have to do....like millions of other women. There is no perfect time to have a baby, and the first time you leave him/her with a sitter is hard...no matter if the baby is 6 weeks old or 6 months old. Essentially, the only difference I see between busting your rear at a low paying job that just barely covers the cost of 50 hours a week for daycare, and busting your rear in medical school is that with medical school you are giving yourself more options in life, fulfilling your goals, and setting an excellent example for your little one.
If you are concerned about the length of medical training, and/or decide to have more than one child during training, there are numerous residency programs that offer part-time track too, offering you more flexibility.
Whenever this question comes up, I always think back to an article Iread once written by a pediatrician who had five children during training. If I remember correctly, she had her first at the start of MS1, and her last a few weeks after her residency ended.
Piece of cake😀