So me and my fiancé had unprotected sex on Christmas, which was the last day of my normal period then we had unprotected sex new years day which was the day I was fertile, January I bleed 3 days, February I spotted, March I didn't bleed at all.this month I bleed for a few days but my period last 7 days I only bleed 5 and my period is heavy this was very light.I took a pee test it said negative.since January I've been more tired, throwing up, having cramps, headaches, diarrhea, and so has my fiancée.I took a blood test late March and it said negative.but my period isn't normal it's more like spotting then a period and apart of me still feels pregnant and I had diarrhea today.please help.is it possible I'm pregnant even though the blood test said negative?

Oh and my discharge is still white and milky