Late Period & IBS

I’m currently 6 days late and I have IBS. My IBS always worsens around the time I get my period. It’s so hard to tell if you’re pregnant because IBS symptoms are similar to pregnancy symptoms. However my periods have been irregular prior to this missed period often times it went from 5 day cycles to 4 and 3 day cycles. I honestly don’t think I’m pregnant but I believe there may be a possibility although I would love to be excited about it however I recently received a phone call from a woman I had no knowledge of but turned out he was married. Has anyone else experienced this.