um scared.....

So me and my boyfriend lost our virginity on Saturday and we used a condom part of the time cause we weren't thinking straight and he asked if he could feel what it felt like without the condom, not think I said sure that was like a minute then he pulled out and said I'm gonna put on another condom but we got intrupted, that was three days before my period was supposed to start. Now I'm scared we've had sex two times after that and we used condoms both times after that. And now it's Friday and my period is four days late. Also I've been having period like craps but no blood. Don't know what to do..... any advice will be appreciated.