Again...what does it mean?

ok so a while back i had problems with my period (oct. nov. and dec.) all of those months i didn't had a period i went to see my dr. she performed a preg test and an ultrasound both were neg. i wasn't pregnant i wanted to get pregnant so she send me to see some other Doctor i talk to her about all my life (all that i been Tru with my reproductive system) and she said that in the last 4 years my body has been tru a lot and that i had finished feeding in july that my body needed to adjust and she told me to keep track of my BBT. my periods, and in a planer for 3 months so i started in jan. and i did had a period that month but i haven't had one this month i was sopused to get one 6 could i be preg.. or is just a false alarm i am taking a HPT tomorrow .. i am nervous...