Is constipation the culprit?

I know this is going to sound hella stupid, but should I be worried?

I've felt pressure in my lower abdomen and I keep getting these flutters about two inches below my belly button/a little above my uterus.

I haven't had sex since late April and I have the implant but I'm still like

I also was taking Iron tablets but had to stop because they made me hella constipated and I still haven't been able to pass many bowel movements. It's been like one time in three days.