Tight?

So, my boyfriend and I have tried to have sex twice now (I'm a virgin) but his dick literally won't go in?? Is that because I'm too tight?? Idk? Then last weekend we was getting it on and he was fingering me, pretty hard and it felt great but the next day I came on my period and when I tried to get a tampon in I couldn't as it was so painful, and I tried again a few days later and it's still too painful to even put anything in there. Does anyone know why :/