22 days late??

Hi, me and my husband are trying to conceive for our second child, having had one miss carriage and it taking one year to conceive our first...., but with his work schedule (14 days gone, 7 home) he's never home on my fertile days so I went out of town to stay with him just so we were together on them :) anyways long story short.... I am now 22 days late and got a negative home test 2 weeks ago and 2 days ago.... I have really sore and tender breasts, I've been dizzy some mornings, and I've been having slight cramps on my lower left side....  My periods are always one time, exactly 30 days... My question is, is it possible that I am pregnant even though I've had 4 negative tests??? With my first I got a positive 2 days before I was supposed to get my period, I tested cuz I had that feeling that I was.... I have that feeling again... Could I be??