Hi laetitia,
This happened with me too with Olivia. Except it was 5 days before my due date and i went in for monitoring as i had been leaking all day and thought it was my waters.
While i was at the hosp the midwife did an internal to try and feel if it was my waters if not she would to a sweep and she had the same problem my cervix was too high up for her to feel anything. I was sent home and told to come back the next day for a scan. I didnt make it to the scan as i started to have pains on the way home and ended up going back at 2 in the morning, by the time i got there my cervix had started to move into place and Olivia was born in the afternoon!
So in my experience your cervix could move at anytime.
I hope your LO makes an apperence before monday