Gas for real!

Alright, ended BC in October. Didn't conceive and had a regular, on time period November 5-8. If on time I should start tomorrow evening. However, the last 3 days I have had the worst, fowl snelling gas my husband told me to go handle that out side haha. Having minor dull pain in my stomache and both ovaries off and on are cramping. Have also had minor back ache in my lower back for over a week now. Anyone else experience this at all before pregnancy or is it more of a period thing.