I took nurofen when I was pg with Kat, I didn't know I was pg and was getting terrible period pains, which was her burrowing in deeper. Anyway, I asked Dr and he said that untill a few days before you miss AF, the bubba hasn't had enough time to implant and draw from your blood etc so it wouldn't affect them. Even a couple of day of little of the wrong stuff won't do a lot of damage. The important thing is to stop as soon as you KNOW or STRONGLY suspect pgcy to give bub the best chance you can. Bubbas are pretty resiliant and untill implantation, surivive off the protien in the egg. Once implantation happens, they start using the endometrium to power their growth etc....I believe you should be ok, but maybe talk to ur Dr/Dentist. (someone correct me if I am wrong. This is what I remember from my nursing, but it was a while ago and I may be a little confused!).