Brown discharge before period due

B👨‍👩‍👧‍👦
So my husband and I started trying to conceive. It's a day before my period is due and I'm having brown discharge, never had this before and was going to test tomorrow (at my husbands family and don't want to by a pregnancy test around them) I'm just curious if this could be pregnancy or just period? Plus my boobs have been sore and heavy and I've been nauseous