I had intercourse briefly (he did not ejaculate but there was precum) on June 29, then a week or two after, I had a brownish dishcharge and slight pink as well. I soon began to feel extremely nauseated and getting sick through out the day. My last period was June 10-15 I believe and recently my breasts are extremely sensitive to touch. I took a pregnancy test the day I was supposed to menstruate and it was negative. Help please?

