Week 18 Pelvic Pain

I am currently experiencing pelvic pain at week 18. The feeling of something pulling down and whenever i walk i feel there’s pressure pulling. Sleeping wise was ok but when i woke up to pee for four times today, my whole leg is cramp and i feel like i just had 24km run. I am an infant educarer and i am taking care of babies which i have to carry most of the infants but my colleague told me only to carry the light weight babies. Any advice, what should i do?