No period signs, but Im not late yet.

I usually get my period on the 27th or 28th, but I get signs, such as tender breasts and bloating, around the 14th-16th. On Monday, (the 16th) my boyfriend and I started to have sex, but we didnt have any condoms and Im not on the pill, so we stopped. He had only been in my vagina like 3 times, and did not cum. I havent gotten any period signs and its the 18th. Could I be pregnant? Please reply.