OK, so i don't won't to waste anymore money on pregnancy tests, or a trip to the doctors.But I haven't had my period in over a month, and it's a little scary.My last period started on March 22nd and ended on the 26th. I had sex on the 31st of March. I usually get my period from the 20th to the 25th. and it is May 4th, so yea, i'm not sure. I haven't been stressed at all.But i have been having major mood swings, i've had a very very low temper,haven't been depressed at all though, just easily angered, and normally i'm a very happy person.The symptoms i've had are tender breasts but that was the first 2 weeks of april, not so much anymore, same time my breasts were tender,i had a couple unusual cravings.I've been feeling very tired lately, but i do work about 35 hours a week and have insomnia.But the past week or so i've been staying awake a lot later than normal.I've had back problems for the past couple years,but it's been nonstop backpain for the past 2-3 weeks.So can you please help?