I am 14-week pregnant and at the end of my core course study. I think it is possible to get pregnant while you are studying at graduate school. But there are factors that you and your partners should carefully evaluate before you make the final decision. I put down some thoughts in one of my articles. Check it out below and see if it helps. Let me know if you have more questions.

http://pregnancyroad.us/about-pregnancy/factors-impact-dissertation-pregnancy/