i am a first time mum and need to know if this is normal

I am 30 weeks pregnant with twins and my lower/bottom part of my bump is getting really painful. It is sore to touch and my husband thinks it is looking swollen (but i cant see, lol)

Is this normal as i know my bump is big with two babies, i thought it maybe the weight of everything but seeing as i still have another 10ish weeks i wanted to check.

Please help..

This is my bump today...

Thank you