Totally normal. I wasn't having periods because I had endometrial ablation. But ever since surgery I've had very regular periods every single month [emoji22].
Assuming you are in the US, no one needs to know why you are out. Your immediate supervisors only need to know how long you will be out. Therefore, you need to come up with a stock answer. " I'm having some health issues and need to take some time off. Thank you for your concern, but I do not wish to discuss it outside my family. " If they push, ask if they had sex the night before. When they freak, you can explain that you view your personal health information the same way they view their sex life - as a private matter which no one is entitled to ask about.
Trust me. It works. Particularly with the do-gooder types who say they just want to offer help. Generally shuts them down. Best of luck.
