Anyone ever had this happen?

MeMe
I missed my cycle last month and haven't had one yet this month. Since I missed it last month, I'm not completely sure when it will come this month. I took about 6 tests and they all came back negative. I went to the Dr on Tues and my test was neg. they even did a blood test and it was negative. 
Only weird thing is my breast are really sore (that never happens). Usually when my cycle is coming, it's only my nipple that is sore. I have been having the urge to pee all day everyday. And if I drink something it's even worse. I have some light cramps at the bottom of my stomach (I always have back cramps but never in my stomach) Although I don't think I am pregnant...has anyone had this happen? 
I'm thinking it could be my cycle possibly trying to come on and it's giving me a hard time. It's just unusual that