Negative test but 12 days late.

Has anybody been almost two weeks late for your cycle; yet you’re pregnancy test come out negative? My husband and I have been ttc our first child. If my logs are correct if I am pregnant I should be 5-6 weeks along. I’m thinking I may have to go in for a blood test because I have no symptoms of getting my cycle, but I’m having a few symptoms of pregnancy. I also have hyperthyroidism so I wasn’t sure if that would affect my HCG levels.