Could I maybe be pregnant?

Brandi • 24, married and pregnant with my 2nd which is also my rainbow:)
I have irregular periods.. one month I'll get af on the 3rd and the next I'll get it on the 13th. Those are examples. This month I got it on the 12th and it was 7 days. My husband and I had intercourse on the 21st, the 22nd, the 23rd, the 23rd, the 26th and the 28th. I was pretty gassy for a couple days and constipated. I also feel a little harder than normal in my pelvic region and every so often I get cramps in my lower stomach. I'm not sure what this is, any ideas? Thanks!!