Could I be pregnant??

My periods are very very irregular. Like I may only have one once a year. I hadn't had sex in a year when I recently started hooking up with a new guy. We've only had sex twice but I'm going to the bathroom way more than usual, like 8-10 times a day and when it hits I need to get to a bathroom NOW. I'm also cramping a lot but experiencing a mixture of constipation/diarrhea. We didn't use any protection. Am I being paranoid or should I get a test??