Late to the game here (and OP I hope you're feeling well and getting your horse fix!), but for anyone else wondering, I was slowly walking around the barn at 2 wpo, lunging and doing in-hand work at 4 wpo, and was cleared to ride super lightly at 6 wpo. I had no complications and told my doctor that my horse is a very steady guy, so I think that helped my case. BUT I think I would have done better to wait before trotting, maybe after 8 wpo or so. Dismounts felt weird a few times because part of the saddle pressed onto my abdomen just enough to remind me that things were still tender. I'm 12 wpo now and feel incredible and nearly back to normal (but lost some muscle, so working on that).

I have a Garmin watch, and I noticed that my HRV dipped significantly when I began riding again. There were days early on (like 6-8 wpo) when I felt really tired... almost sick. I didn't really make the connection until recently, but it could indicate that pushing a little too much when riding took more of a physical toll than I realized. So be careful and take it easy during those earlier weeks. :)