Prolapse or Cervix??? Please help.

Hi ladies -
I recently noticed ridged flesh sealing off my vaginal opening. I've called and emailed my midwife but still have yet to hear back. 
I've been doing a lot of online "research" where I've come across Cystocele and Rectocele. Basically it's either the bladder or rectum prolapsing onto the vaginal wall(s) causing it to fall towards the vagina opening. 
I'm 37 weeks pregnant and at my last appt my midwife said my baby's head is very low. So my question is, has anyone experienced this before and if so, do you think it's a prolapse of some sort or maybe my cervix ??