Breast Soreness and bathroom troubles


Hello all. My husband and I just started trying for a baby this month. My period is due in about 5 days and I am experiencing some achy breasts and bathroom troubles. Breasts are not sensitive, however they do feel heavy and are achy underneath when I press against them. I have been having some constipation and upset stomach the past couple days as well. I’m wondering if anyone has insight on this. I’ve never had my breasts feel this way before a period is due so I’m wondering if by some miracle we managed to get pregnant on the first try or if it could just be the upcoming period. I feel like it would be too early to notice these symptoms if it is indeed a pregnancy. Thoughts?