I am much older than you, but can say as a women who was pre-med herself, I understand the stress and demands on you during school. Medical school is worse (I didn't go, but many friends did). However, I have a very demanding career and was so worried when I became pregnant. How was I going to handle having a baby and a career? None of my friends work. Well, I am on number 3 and I can tell you it is not that hard. What is important is that you have family or a support network to help you take care of the baby. If your boyfriend is supportive and willing to help and you have a mom, sister or someone that will be there for those cramming sessions, then you are in good shape. My 3rd pregnancy was unexpected and I also had twins ( lost one). I was very upset. My husband of 11 years was against having another child. He is still very mad at me. However, when I saw those 2 little heartbeats on the ultrasound, I couldn't "take care of it" if you know what I mean. I'm now 16 weeks pregnant and happy with my choice to keep the baby. Even though I lost one, I know I made the right choice. My husband also is not working and our finances are a mess, but in my opinion, this is a blessing. Interestingly, I also have a friend who is a twin and ironically, his parents were both in medical school when they found out his mom was pregnant. Both parents made it through medical school, are doctors, and have two awesome twin boys, now age 23. So, It is your choice, but I think you can make it.