Am i preg or stressed?

I was suppose to get my period April 1st (day before prom) well I didn't want it prom night so I had sex with my boyfriend April 1st. We didn't use any protection. We had sex again on the 3rd, 5th,and 7th. And again we didn't use any form of birth control. I have been more tired lately and feeling nauseous and craving strange food like bananas wrapped in bologna... Weird. I took a pregnancy test on April 21st cause I still haven't gotten my period and it came out negative. I'm suppose to be expecting my next period on may 5th and I don't feel bloated, or have any mood swings. So Idk what's going on with my body right now lol. Please help.