help

I had a period 2nd  jan and had unprotected sex on the 3rd days this stopped my period again unprotected sex on the 7th I've in the last 2 week had really sore boobs real agony with them I'm not sure if there darker I've had nausa. . Light headed dizzy. .on and off food .. strange feeling of something  happening in my belly light cramping back ache sore and bleeding gums  forget full  hip pain bloating also have a possible  line on my belly although I could be just seeing that because I want to I've had a brown discharge then pink then red like I normal light period now some very light mucas my period is due in 3 days I've had a few negative tests I'm so confused and starting to obsess I've read so much online if I was pregnant then I'd b 3weeks 3days