Should i be worried???

I was supposed to start my period July 6th. I usuallybdint keep up with my periods because they come at different times. I was anemic and my periods were so irregular, but I recently just gained a lot of iron back & I've been noticing just the past few months my periods have been starting around or a fee days before the 6th. Well its the 11th and I have no period, no symptoms, to sore breasts (which I always have) , but I do have a slight fever which I get a week or so before mg period. But should I be worried I'm pregnant? I had unprotected sex, but he pulled out way before he was going to .......... I'm so scared . I have crohns disease I can't have a baby right now 😩😩