Hi, I have not missed my period yet but I am on seasonal not due for one until middle of next week. I have been very tired, mood swings, weight gain , lower back pain , increase in appatite, breast are a little sore, hard stomach...I have taken a pregnancy test came back negative, but this happened with my son and i was 8 weeks pregnant. Anything else it could be? Should I be checked out or wait until I miss my period?