Hi i was wondering if someone could help. i’ve been on the pill for around 4 months now (21 days on, 7 days off) and started taking my new pack 5 days ago. i had sex two days ago, but today my dentist has prescribed me metronidazole for a gum infection. he told me this would interact with my pill, but the chemist said it wouldn’t and so does the NHS site. i’m not planning on having sex while on it, but will it affect my pill and get me pregnant even though i had sex 2 days ago?