Could switching birth controls cause these odd symptoms?

So basically I went from one combo pill, to another combo pill, to Nexplanon in a matter of a month.

I know this caused my body to get a bunch of different levels of hormones.

Lately I've noticed

•Darker nipples

•Increased discharge

•Weird twinges in belly (could be because I'm constipated AF tho)

•Terrible cramps on first period on Nexplanon

My periods have come normally and everything so no problem there

(Haven't had sex for like two and a half months)