Last Friday I Had Sex With My Boyfriend A Day

Last Friday I had sex with my boyfriend a day after I got off my period and the condom broke so he pulled out but this happened before he was even close to cuming but I was still worried that there could have been precum so I took plan b less than 24 hours after. this was my 6th time taking plan b over 3 months. The last I had taken plan b was exactly two weeks before. The next day Ive been having a really bad headache and I have been having random pains around my abdominal region and just started spotting today but my period is due for next week. What is happening I'm freaking out...I'm going to the doctor next week to get on birth control but I am so scared