Trampoline?

So I'm 40+3 weeks pregnant today and my midwife wasn't able to do a sweep on me as my cervix is high, she mentioned getting a gym ball and it sounds silly but I don't wanna be spending money on something I'm only going to use a hand full of times then it to be pushed to one side so I was wondering do you think it will be safe if I sat on my trampoline and just bobed up and down on that? So I'm not bouncing at all standing but just gently Bob on it sitting down! I wouldn't put my baby at risk by actually jumping.

Many thanks