I’m I pregnant?! Please help?

About 2 weeks ago I had unprotected sex, right before my ovulation started according to the app, and he pulled out but I know it’s not safe, so I took the plan B pill a few days later like about 3, and then on Friday I had a like a little strange brown discharge, and it followed the next day with a heavier discharge, it was more in the dark brown side but in the toilet it was like drops of blood. I’m supposed to get my period in two days, I had taken first response pregnancy test and all of them came negative but i think I took them too early. the odd part is the discharge that it came for two days and it stopped. That has never happened to me. Do you guys think I’m pregnant? Also I had cramps during those days, and I’ve even waking up a little bloated. Apart from that everything has been normal.