8mpp sex

I’m 8mpp and we have sex 1-2x a week. Nothing crazy but life with two littles is enough to keep us tired. When we had sex after our first, I felt fine. When we have sex now, I have a soreness feeling for a day or two. It almost feels like that soreness a few weeks after birth. Is this normal after 2 vaginal deliveries? I had a 2nd degree tear with my first and no tear with my second.