Hi, ok I had a tubaligation 3 years. Ago. And now for about 6 days I have been having lots of pressure in my lower stomach a little crampy on each side of my lower part of my stomach then it would do away and come back again but the pressure stays for a long time, I have been tired, and mody.. So I assumed my period would be here cause I had it last month on the 7th of january, I added up the day so I took the test yesterday and it was negative what could be going on with me? Also I have thryoid diease. N iam taking meds for that, would that be why iam having symptoms like this?