Pcos help

I've been taking metformin for two weeks recently tested positive for pcos confirmed through ultra sounds I'm not heavy at all so straight away they put me on medication since I really had nothing to loose , my books never hurt not even before my period which they are irregular but I never know when There coming I got off birth control 6 months ago. My boobs are sore today which is really unusual ...could it be the medicine I am trying to concieve...