Omg mamas! Sorry if TMI

But I am 12 days postpartum(also FTM), and today had some alone time at home while the hubby and baby were out. I was feeling a little frisky so I decided to try playing with the for the first time since giving birth(all outside, nothing inside). It went great, woo hoo, I took a nap. 2 hours later I wake up and my ACHES!! Like a deep ache that feels like I did 3000 kegels everyday for a week straight. I took some ibuprofen but like wtf!! I knew some weird stuff would happen after birth but wasn’t expecting this. Anyone have any experience with this or know why it happens?