Pregnant yes or no?

i'm a 19 year old female. my boy friend and i had on the 27th of march. i don't get my period till April 10. i have been really trusty lately and felling so unconformable pain by my ovaries. im all ways hungry.and my Brest have been hurting a lot. i fell like I'm going to throw up. i took an at home pregnancy test and it came back negative can i still be pregnant