Hello, please advice. Several times in my cycle, mainly in 2022 (May, July, August and November), it happened that my menstruation was a few days late. I did tests and the gynecologist prescribed me birth control pills to regulate hormones (estradiol too low, progesterone 17OH high, other hormones normal). Belara tablets - I started taking on the first day of menstruation, which was to start on 21.01. In the meantime, I also consulted a dermatologist because I had problems with acne. I was prescribed tetralysal, which I have been taking since 10.01. Menstruation appeared on 20.01 and I immediately took a Belara tablet. On that day there was intercourse (my husband did not have a condom) and on the second day of menstruation we also made love. Please advise; Could conception have occurred despite menstruation, despite contraception? I read that this drug weakens the effect of contraception and I am a little afraid - mainly that tetralysal is a very strong antibiotic and something could happen...