Pregnant?? Or... Not??

Tuesday
Got married in March of this year, and EVERY MONTH I think I'm pregnant. A lot has changed though, before I got married I had a super regular 28 day cycle that was very predictable. Now it's more of a 40 day cycle and I get so lost.
Today is day 20 and I've been having light cramps, sore boobs, etc. I just wish I could know early on.