A sexually transmitted infection typically should not have any effect on the interval between your periods. Although the sexually transmitted infection may cause symptoms in your vagina, uterus, or urinary tract, it should leave your ovaries, which are responsible for regulating your menstrual cycle, alone.
Therefore, I don't think that the fact that your period this month is different than usually is related to your recent sexually transmitted infection directly. For this reason, it would be good to have this issue checked out by a doctor
, either your primary care doctor
or your OB GYN doctor.
First, I think that your doctor will want to make sure that the sexually transmitted infection is cleared up. Sometimes, there can be vaginal discharge from an unresolved infection, and making sure that this is not clouding the issue is important. Also, it would just be reassuring to know that the infection is over!
Another possibility would be related to whether or not you take birth control
pills. If so, then whatever antibiotics you took to treat the sexually transmitted infection may have interacted with the birth control pills such that your period is more irregular this month than usual.
Please make an appointment with your doctor at your convenience.