Stomach Aches

My husband and I have been trying to conceive for 2 months now and the week before I got my period this month(month 3) I started to get stomach aches and naseau. My period ended up being over a week late and the day after I was extremely bloated and gassy. It was the weirdest thing. It was actually painful. Almost like there was a balloon in my stomach it was so hard and full. Any ideas what this could be?? 😳