Has this happened to you?

So.. first post. I don't know all the abbreviations and lingo so forgive me. Lol. Long story short, I'm 31, mother of a ten year old and a fourteen year old, and I had my Mirena taken out last October. Since then, my cycles have been 29-30 days on the dot. I'm at day # 34 now. Two negative pregnancy tests yesterday. My first two babies, I was positive days before my missed period. Now I'm late with negatives. Anyone get negative tests at 5 weeks and actually be pregnant? I'm having labs drawn in the morning to hopefully get answers. But that's days away and I'm nervous as all get out. 😬