Sign of pregnancy?

Only when I lay on my stomach, it starts cramping. I don’t know if it’s my period coming soon or if this is a sign of pregnancy. I haven’t had a period in two months, but for two months straight I have been having cramps only when I lay on my stomach.

That’s literally the only symptom I have as of now. In general I’ve only had cramping, constipation and bloating.

My pregnancy tests keep coming back negative, can’t really make sense of it. Trying to get an appointment, but so far nobody has picked up.

My periods start on different days of each month, but I don’t ever skip 2 cycles.