for the past week my nipples have been extremely sore it hurts to even put a bra on i have had a really bad lower back ache i feel naseous all the time but never actuall throw up i have no energy at all no matter how much i sleep i dont think im pregnant i just had my period on the 25th of april although me and my fiance have been trying for another baby for a while now could you please tell me if these are symptoms of something else?