Please, am I pregnant?

Ok, so I get my period for 7 days every month. I am not on the pill or any other medications. My boyfriend and I slept together unprotected and he "went inside", that was on the third day of my menstrual cycle. I did not get the other four days of my period afetr that and just felt off. Since then I have gotten randomly nauseaus and vomiting, headaches, lower back pain, and have been really emotional and irritable. i just feel pregnant. I took a test but believe it was too early and it came out negative. My expected period isn't til the first week of July...So what do you think? Oh and I've been craving random foods that I noramlly wouldn't eat...like cole slaw and yoo-hoo.....