Need help!

Hey guys! Here’s a background: I was on the combined pill for over a year. I recently stopped taking it in June after my cycle. I had a normal period starting July 16th. I am currently 9 days late now after 2 months of stopping hormonal bc pills. Since my last

period I have had sex 3 times, all protected with condoms & withdrawal. I was supposed to get the copper iud inserted during this cycle. I am just confused on why my period was normal last month & nonexistent this month. We have been using protection, but there was once we only used withdrawal. Please help if anyone has experienced anything similar!! Much love!