Universal Studios, TTC, and Plus Size?

Hello! My hubby and I are considering a trip to Universal Studios in March (primarily for Harry Potter World!) And have never been so we are looking for some insight. I'm not sure if I'll be able to ride the rides because 1) I hope to be newly pregnant by then (I have two ovulation dates between then and now) and 2) I'm plus sized.

I am about 295 and 5'2" so I'm skeptical about being able to ride. I'm wondering if anyone with a similar body type can share their experience?

I'm also wondering if there's enough to do at both parks over 4 days if we don't go on rides or if we will feel like we missed out on the experience/wasted our money going without getting on the roller coasters.

Thanks in advance!!