P.M.
I have had many cysts and even some that have ruptured. Not a fun time...
If the sac was on the ovary, then there shouldn't be a problem with an etopic pregnancy. Cramping is normal for a cyst. I knew when I had one on the third day, the pain would radiate from the particular ovary all the way down my leg. They would either rupture or the pain would just go away. Just as with any pain situation, don't wait to take meds AND make sure you keep on the dosing schedule. I have used anaprox - now called alleve for over 20 years.
I would have months where the pain was there everyday at different levels. It just depended on how big the cyst was. I hated when they ruptured, but I felt better down the line when they did.
Contact your dr.s office and find out where the sac was and then ask how much alleve you can take. I have a dosing schedule, but everyone is different.
Heating pads do help, hot bath, and a tremendous amount of patience.
Take Care,
P.