im soo confused! help!

ive been pregnant twice both times with twins. both unexpected 1 time slip ups. this last pregnancy i lost my twins due to ttts. now im trying to conceive. 
​my periods are pretty normal but ive never kept track. ive started keeping track this month my last period was on the 2 of jan it says i should be ovulating tomorrow being highest time of me being fertile. 
​but my cm really hasnt changed its real wet and slippery. but last nite while having sex it felt way tighter to me and my husband. is that a sign of ovulating? or why does it do that?