Advise

I just found out that my husband ( 7years) has a relationship over the with another girl in another country for more than 9 months because I found some messages on his fb. I just don’t know know what to do because he has been the same person with me I don’t have any problem just that I wanna tell him but I wanna wait till my baby comes because I have high blood pressure with my pregnancy so that’s why I don’t wanna fight or argue with him till February when is gonna be my due day but I feel I can’t keep it till that day😒.