I had unprotected sex on June 27. I took plan b on the 1st because i just realized i was having pregnancy symptoms. i know thats stupid cause plan b doesn't work for an existing pregnancy but i was scared. I am not on birth control. I was practicing FAM but i guess i made a mistake close to ovulation. That was the only time i had unprotected sex. Still feeling symptoms but that could be from the plan b. Can a woman get pregnant right away after unprotected sex??