Help...

I took a blue dye test on Thursday. Came back negative. I still feel nauseous and extremely tired. This morning I woke up feeling the worst nausea. I’m supposed to get my period tomorrow, though I’ve never been regular I always know when it’s around the corner. Mainly, when my husband I have sex my vagina always tightens up and hurts. I haven’t had any tightening or vaginal pain during intercourse with him. My CM has been like it had during ovulation. I still think I may be pregnant but I keep getting negative results. What do I do?