Strange feeling..Please help

Ok so Dr Q you know the story I have had a postitive opk on wednesday of this week...now I am feeling the pulling feeling between my legs like in my pelvic area...it is hard to explain but it feels like a lot of pressure almost like some one is inside of me and truing to pull my vagina out or my cervix...i am not sure what this feeling is..but could youlet me know what you think it could be....i also have some puslations in my vaginal area....Plese let me know what you think