Im still confuse. I really need a help to enlighten me. Cause right now i dont know what to think.

1 day after my period .. i had an intercourse with my bf. I took the pill immediately but i never continue it the following day. 1 week later i had this period again and the color is like brown but i assume its blood. I am so bothered and still confuse .Is this the bleeding on the stage of pregnancy or it is just normal since i took only one tablet and never continue taking it. Could i be pregnant? I hope some could see my post and give some oh your thoughts. Thanks and godbless!