TTC & late.

My last period started on January 31 and lasted five days. My period before that started on December 15 and lasted for five days. So naturally in January when I was so late we tested and was negative. Finally came two weeks later(1/15). Now it's been the same amount of time and still no period. I have had SUPER sore/tender breasts for two weeks. Like they have never hurt this long before or this bad. They usually got a little tender before I started but nothing like I have now. And I have been cramping for two weeks, not as bad as my period cramps are though. Do you think it could actually be?! I just keep telling myself that I'll wait another week to test, hoping eventually my period will come. This is our third month trying and I get so depressed seeing the negative result. Well tomorrow (3/20) is my birthday. So if I don't start my period anytime today I am going to test first thing tomorrow morning. Pray and hoping for a positive result.