I know it sounds super insane but need advice

I had Nexplanon put in in June. In the middle of July, I started getting these weird stomach twitches and a feeling of "movement" all over my abdomen. (Note I do struggle from GI issues but haven't had this before)

I had unprotected sex (withdrawal) after missing a pill at the very end of April but doubled up the same day.

These movement have been really freaking me out. It's not big movements but small and I can't really feel like when I lay my hand on my stomach or anything. I had several negative tests throughout the summer and an ultrasound in the beginning of August that showed nada.

Is it possible I could still be pregnant? I have only had sex a few times with condoms since then due to my anxiety.

*Current photos of stomach*