Overweight and Pregnancy Test Results?

Okay ladies. Hubby and I and TTC. I am currently 5 days late on my period but still getting BFN's. My period is VERY regular so this is definitely not usual. And I am experiencing all the symptoms (nauseous all the time, diarrhea, super tired, crazy emotional etc ) but can't get a positive. I have read however that being over weight messes with the HGC levels and causes false negatives. So I am asking all my curvy mommas if yall had the same issue? Am I just losing my mind?? I just want to see a positive or at least know what's going on with my body.