Frustrated and Confused 😖

I'm at a complete blank here. It has been about 5-6 days since my AF was supposed to arrive. I've been super emotional, tired beyond belief, been getting dizzy and nauseous everyday, and have had heavy CM. I've taken 4 tests 2 negative and 2 faulty tests. My fiancé believes the two BFN and says I'm just late. But this isn't normal for me to be late. If anything I'll get it a day early every once in a while. It's driving me crazy. My fiancé says to just relax and forget about it. That me stressing over it is only going to delay my period even more.