Please, help.

First off, I’m so sorry if this sounds stupid to anyone. I’m extremely scared. Thursday, my boyfriend & I had unprotected sex, he didn’t cum or precum. At this time, I was ovulating & yesterday I finished ovulating. Today I have pinkish discharge, and I saw a string of blood when I wiped. I feel a lot of pressure down there. I know I cannot get pregnant without cum/precum, but why else would I be having pink discharge and bleeding down there? I am not old enough to have a child & I want a future, if I am somehow pregnant I will be kicked out and homeless. * I did take a pregnancy test and it came up as negative. Someone, please help. I am very scared and nervous. I don’t know what is happening. My period is supposed to start in 12 days. Thursday, him and I took one another’s virginities. Could it be because of that?