Overweight and late

So I weigh about 260lb and I'm on day 54 of my cycle no period. I took like 5 cheap preg test and BFN last 2 weeks. all I drink is water so I don't know if that means anything with the test. I read that I might my hormone levels might not be enough for the test I really don't have any symptoms except my boobs hurt mild cramping gas and bloated. Maybe being over weight has something to do with this all I have thyroid disease anyone have any advice for me trying to get pregnant? Going to the doctor tomorrow for blood work. Thanks