Hello.. on the 27 of Feb I had unprotected sex with my boyfriend ..he didnt ejaculation inside me but read somewhere about precm...it was 2 days after my period ended. On the 28 approximately 32hrs I took plan b. A week later I started bleeding. .my blood was mostly dark brown and lasted for about 4 days.my normal period usually lasts 6 days. 2 weeks later which is now I'm experiencing cramping and breasts are full and sore.. Could this be a sign of pregnancy maybe pms since my period is actually due on the 17th of march?