I had my periods two weeks ago and im feeling nausous, sleepy, moody. Even having back pains and breast are sore.

Hello and welcome to EmpowHer,
Your chances of pregnancy at this point is directly related to when you had intercourse. If you have intercourse between now and your last period, then pregnancy is possible. If you have intercourse before your past period, pregnancy is not possible.
Vaginal bleeding can occur while pregnant, however is it much lighter and shorter than a regular period.
I suggest that you wait until your next period. If you miss it, take a pregnancy test. For now, if your symptoms still increase, see a gynecologist and get a pap smear.
Most doctors recommend taking birth control pills to decrease PMS-like symptoms and regulate the menstrual cycle.
Faith