Hi There, Okay So Here's The Situation Doc... I Got

Hi there, okay so here's the situation Doc... I got my period Thursday of last week and I had unprotected sex that Sunday and my period stopped usually i have my period within 4-5 days. Anyways I then took my first Plan B pull that morning a few hours after sex. Then later on that same Sunday night we had unprotected sex again and I went and got another Plan B on Wednesday and took it. Now yesterday which is Sunday again we had another unprotected sex and he cum in me. Today I just noticed some spotting or someone of like my first of having my period. I'm confused can you let me know what sytoms they are? if I might be pregnant and when is the easiest can I test the pregnancy test to find out?