Cervix positions

I have been ttc a long time but recently started tracking my cervix position. I have a long cycle and I think I am due af any day now due to pms symptoms. My question is can your cervix position change throughout the day? Until yesterday after o it was low and hard, this morning it was high ( I almost couldn't reach it), this afternoon it seems to have dropped a little but not as low as it was. Any ideas?