Babies head

Kayla
I went pee a couple hours ago and after felt but did not hear what was like a pop(??) not even thinking I stuck my finger up and it didn't even go in half a finger before I felt something hard... I'm assuming the head. I was station 0 last Wednesday 50% and 2.5cm. For 30-45 min after I felt the sensation to have a bowel movement, would have tightening but no contraction pains... I've had a few contractions but nothing serious, the doctor told me this is my fifth and I will know.. But nothing about this pregnancy is the same... So if my cervix was 50% last week then I must've felt the head??? Was the "pop" the head moving down? I'm so confused!!