Feeling "full"...

For the last 3-4 days I've had this "full" feeling along with some strange pains almost like a sore muscle, kind of a pulling, in my lower abdomen where I guess my uterus is. Now today it's gone. AF is due the 25th. My ovulation test results have been all over the place. They've told me I've ovulated twice so far this month along with several low fertility days and now today it says I'm at high fertility. My husband and I have had sex at least every other day starting on the 5th. I'm just confused as all hell this month!!