 [ Symptoms ] can using metronidazole gel affect results of a pregnancy test  i am on my last day of using metronidazole gel and i was supposed to start my period on 092915 i am currently 3 days late i have done 2 at home pregnancy tests one early detection one and the other not an early one the other urine one was done at a dr office i was wondering if this gel can effect results of a pregnancy test [ Disease ] perhaps higher but i could not provide you with a number or percentage since i do not know the type of breast cancer that your mother has to know if it is a type that is genetically linked your mother can ask her oncologist and then let you know if you are at a higher risk