11 days late

Removed my iud 2 months ago, I’ve been 11 days late on my period had multiple pregnancy tests and. a blood test .. ALL NEGATIVE! My fiancé and I have been having unprotected sex only, been feeling a lot of things in my lower abdominal but it just may be paranoia, meanwhile I’m nauseous, having crazy mood swings and just felt like a constant weight on me 😭😭 someone help? The doctors said they aren’t worried about me unless I go 3 months without a period. I’m stressed af!! Someone tell me I’m not crazy