I feel pregnant

Steph • TTC for 10 years. 3 rounds of IVF. All failed. Hoping to conceive but looking at surrogacy.

This cycle has been tough. My AF was over a week late. I bled for 2 days then stopped 2 days later a little more bleed then gone. All month I had strange feelings like nausea and weird boobs. Even got blue veins on boobs. But all HCG has been negative. Not even faint lines. Started testing OPK and nothing was showing until yesterday which is supposed to be my strongest LH day. Im just so confused. My body is swollen, keep getting dizzy and feel sick. Any ideas on what could be happening?