I had unprotected sex a day after my period was over. We used a condom and he came but then we took a break. We had sex again but without a condom and he pulled out. I bled a little that night. I had bad cramps the next day. It's been two days and now I'm having a brownish discharge and have weird cramps like if I was on my period. My calendar says my fertile window is active. Could I be pregnant??