I have a history of a fairly serious back problem (in fact, I was pretty stressed at the start of the pregnancy because we'd delayed TTC until my back was doing well with access to gym, swimming pool and physio, and then of course lockdown happened!) So I'm feeling very proactive about trying to manage back and hip pain.
Hospital physio has rung me twice, given me exercises and advice, and told me to ring them anytime at all if I need anything. I really recommend getting in touch with them if you can as my experience has been great. I think some private physios in England might now be open for face to face if you have the money - my experience has been that it's worth it, but as I say I have had quite a serious problem in the past.
I'd also recommend a book called Pilates for Pregnancy, it's got guidelines, exercises and set work outs for different stages. I've found it really useful.
And I've been managing some sea and lake swimming, which really helps me, but your mileage may vary on that one (I discussed with physio and midwife and they agreed risks to me from not swimming were greater than risks from swimming, but I have quite a bit of experience outdoor swimming, and have safe places to do it.)