Issues down stairs

Before my daughter was born I had no issues at all when it came to sex...now that I have given birth etc....My sex isn’t the same with my husband.... I don’t have a yeast infection or anything according to the obgyn however, I always get major pain during sex is uncomfortable once we are done.. it becomes very irritating down there almost like a burning sensation and sometimes it swells alittle anyone else suffers from an issue like this ?