Sex hurts HELLA HELP

So last weekend I lost my virginity to my boyfriend. It hurt pretty bad but I barely bled and I felt the “pop”. We had sex six more times over the course of three days and by the third time it felt really really good. Right after that I started my period 🙄 so we didn’t have sex again until last night. I was pretty wet and I thought I was turned on but we went to have sex and it hurt like it did the first time. I even bled (very, VERY badly) way worse than the first time and felt the pop again. Is this normal? Why did it hurt again when it had felt super good a week before?