TTC after Mirena

Mollie • Mom to Sydney and Savannah and Samuel
 Advice please! I had my Mirena removed May 7. I got my first period May 17 and it lasted about 10 days. I have been trying to track my cycle and ovulation but because it seems irregular I'm having a hard time. The app says I am due for my period tomorrow. I have no period symptoms but a few pregnancy ones. I have taken a bunch of tests and all negative. Is there a way I could still be pregnant or does it usually take longer? Anyone ever had the same experience after Mirena? Thanks!