Why do I feel discomfort and cramp feeling on right side of stomach?

I message my doctor about it but the nurse just said go to urgent care. I don’t want to go there as it’s a place for only super sick people and i won’t be seen or be skipped on the list and wait 10+ hours in the waiting room.

since all week I feel a weird cramp feeling right side of stomach kinda on the back area. Like a cramp twisting feeling.
since this week I’ve been on my period also since this wk the depo shot birth control shot expired, so I don't know if it’s side effects of the shot wearing off and period?
I also have bloated belly feeling like a balloon I feel like but that’s due to not taking my acid reflux medicine. Wen I stop taking it I get balloon belly can’t eat or breathe & heartburn.

I took a pregnancy test last Wk and negative. Also I got stomach cramps Monday last wk. so I don't know.

i read online the back part of stomach right side is gas, kidney, gall baldder, pregnancy symptom?

maybe it’s new period symptom? or effects of the shot wearing off?

Why do I feel discomfort and cramp feeling on right side of stomach?
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