 [ Symptoms ] my period is late i am safely sexually active with condoms and even pulling out while also using one taking biotin we have been together for over 1 year i have never been this late before it is been 15 days already we have sex but he always uses a condom and he does not even ejaculate inside even though he is wearing one i have been taking biotin supplements and i am worried or thinking that maybe that might be the reason other than pregnancy i took a test and it was negative that is the only other explanation i can think of [ Disease ] i would try one more test just to be on the safe side supplements can have different effects on every woman if it is not the supplement making you late any change in stress factors or hormone changes can cause you to be late