I've been taking extra strength Tylenol for my migraines and have had to take 2 every 4-6 hours as needed and my baby is fine.
The dosage info should be on the back of the package (but of course, that's for non-pregnant people)...
Have you tried a pregnancy belt? I had a lot of pain and a girl friend recommended it and I wear it every day now. Definitely buy one in the store instead of online because the sales clerk should help you put it on and may let you try a few out before you buy (and you can wear it around the store, too). I also bought a belly band to wear underneath because some women posted online that it was itchy.
I take extra strength Tylenol, my doctor told me it was fine to take. I take two every couple of days
Taking 2 regular Tylenol not extra strength when ur in pain is fine, I never used heating pads