Sex after birth...

C 💕✨
After having my daughter I felt almost back to normal immediately because of having such a straight forward labour so after 2 weeks I felt I had waited long enough for sex as we hadnt had it in a while leading up to the birth. My bleeding hadnt stopped though and we have had sex twice more since then ( it's almost 4 weeks since i gave birth) but now i have a crampy feeling very low down like period cramps which come and go and bleeding still hadnt stopped. I am worried as i have read you can catch an infection by having sex before the bleeding ends but cant find any information on the infection or what the symptoms are 😖 does anyone know anything about this? Xx