First time difficulties?

Hey girlies! My boyfriend and I had sex earlier today, the first time for both of us. We have found that I am normally pretty tight but it was very difficult for him to go in. Throughout the day I have noticed a little blood in my underwear and when I wipe. I could feel my hymen break, but I wasn't sure if that was where the all of the blood was from. The condoms had lube on them already and my boyfriend and I were very gentle. We have also found that we aren't very good at positioning ourselves either and it isn't the most pleasurable time for both of us. Any advice and possible reasons behind the blood? -C