I am 12 to 19 days late and all symptoms of pregnancy?

i am 21, i have never been late, my bf and i have sometimes with out a condom and use the pull out method and if we use one its not till after we "get in to it". i have my period every 28-30 days "i think" my last period was Feb 12 or 13th 2009. i didnt really pay any attn: to how it was. but it is now March 26 2009 and i havn't gotten it yet when i was suposta get it i had a little of pink and dark brown spotting for 3 days and only could see if i took the tampon out at the END of the day. it wasnt anything to it al all. that would make me anywhere from 10days late to19 depending on how long my cycles are.? ive heard and read storys about mind games ect. but i always had to take sleeping pills to go to sleep. now i take naps in the after noon and fall asleep like a baby. starting two nights ago i havnt been falling asleep as easly but getting up in the middle of the night to go pee now, i have been beeing a lot the past 2 weeks almost. i am having lover back aches and headaches. my are fake and always firm but they seam to have a diff ( weight) to them now and my are a bit darker and ( puffy). i took a shower to see if it would help with the back aches and the water hitting my felt like sharp stings. my pants are not to small but not fitting correctly around the waste a bit snugg and my bras are fitting just a bit diff also. my lower stomach "feels a bit "firm" my eating has gone up more at night, wanting crackers or somthing just to calm my stomach. i dont have much stress and a happy person. i have taken two PG home test and negative. my close friend took home test after home test and two negative boold test before she found out she was 4 months pregnant. and i know a few other people with neg test and didnt find out for a few months. i know everyone is diff in the way hormones work and if they show the first few weeks or not till a few months down the road. i am just curious as to what people tink and if you have had all these symptoms and found out if you were or were not preg. and how long it took to find out the real answers.