I have period cramps but no period, any ideas?

Me and my partner are trying to concieve and my last pms was the 15th september and i ovulated the 27th september and we bd the 27th, 29th and 30th. I'm due my periods tomorrow and ive been crippled all day with period pain and dont normally get the pain till at least the second day of my pms. I'm really hoping im pregnant something ive been waiting for wat seems like forever. I havent really been sleeping and my are tender and wandering if there is a chance i am pregnant, and if anybody has any advice for me?