Am I pregnant??

Hello! On may 15 me and my boyfriend had unprotected sex! He said he dont think he ejaculated inside me. So i thought everything was ok. Its now been 3 weeks. I first started getting this creamy white stuff but only one day. Then i would wake up feeling really tired and felt like i had to vomit through out the day but never did. Then last week my breast became very sensitive. I talked to my friends and they said its in my head and im not pregnant its jus signs that my period was coming on. My period was late. It came on today and it was brown and a little red. When I whipped the area with wipe it was brownish n type slimy. Im planning on taken a test monday.