So I startwd taking metro antibiotic for BV at the beginning of October and it was for 7 days twice a day. I was suppose to get my period the 26 and I am 4 days late. I am getting sore breasts but i usually get this when i am about to start but i have been having soar breasts for the past couple days with no show of my period. I dont know if i am pregnant or if the antibiotic is delaying my period.