I have a question of a sensitive nature ? Girls, when did you start h…

I have a question of a sensitive nature ? Girls, when did you start having sex after childbirth? I went for an ultrasound and it showed that everything is good and everything has shrunk. I had tears and we with my husband wanted to try PA (40 days passed) after this the seam started to hurt. Is that how it should be in general? She said if within a couple of days it doesn't go away then to see her.