36 weeks pregnant

Tia

Hi, don’t no if anyone can help me or give advice or has gone through this themselves but I’m FTM and not sure what to expect... I woke up this morning knickers were quite wet so I changed them and then about half an hour later they were quite damp again. I called the hospital they said put a pad on and call them in an hour to say how wet the pad is, the pad wasn’t to wet just slightly damp but mostly dry so they said not to worry about it for now but if it gets worse then give them a call back. I’m now getting some period cramps and then the need for bowel movements but when I try to go toilet I get a really strong pain which makes me scream out with all the pressure going to my bum which I can only explain really bad period pain but that pressure will go when I don’t push to go toilet. What do use think? Is it just normal experience at this time in pregnancy or should I call the hospital and explain this to them? Thanks x