time but is this normal

this is off topic but I've read that your hymen has a passage that's where the sperm goes thru to start the whole process of pregnancy (most of the time) but I've recently noticed that my hymen has no open area like no passage what so ever its litteraly a round ball. I'm wondering if that could be the reason why I haven't convinced but then again how am I receiving blow flow from my period? I'm sooo confused! ?