cervical position?!

so my fertile week started on the 21st/22nd. we bd on the 22nd and my cm was sticky/tacky and it was medium height. we bd last night and my cervix was super high but cm was sticky/tacky. today my cervix is super low and soft and cm is still tacky sticky. I'm supposed to ovulate tomorrow, and clearly I know opks are the way to go but I don't have any. I'm just wondering if it is normal to drop the day before it is supposed to be it's highest? fingers crossed I get the magic cm!!!