internal stiches ? vaginal delivery? painfull sex?

Dervi

6 weeks ago I had vaginal deliveryvand an episiotomy. external stiches have fallen.i eanted to know how do iI understand if my internal stiches have fallen? we had sex for the first time after birth and ot was painfull. was it bcs of the stiches? or maybe just painfull and it is normal?