I don't think that there is anything to prevent that from happening. I had an ectopic pregnancy in 2004, and later I was reading about a medicine that I was taking at the time, that can cause an ectopic pregnancy. So, if you are taking any medicine, you might want to read about it if you are trying to get PG. Just to be on the safe side. I'm Bipolar, and I do have to take meds daily, but at this time, I am not taking any because I am not sure if I am PG or not. I don't want to have another loss. ↑