Late Period Questions

Hi everyone! So I’m 12 days late for my period and I’ve taken 4 pregnancy tests and they’ve all came back negative. I have slight lower abdominal cramping like a 1 or 2 on a pain scale (feels mostly like gas). I’ve been TTC for 2 years. I’m not really sire what to do, has anyone else gone through this? I feel a little different but I don’t wanna get my hopes up. Has anyone gotten negative pregnancy tests and ended up actually being pregnant??