i had sex for the first time march 31, using protection (my boyfriend said he didnt think the condom had any tears in it). on april 9 my period hadnt come yet so i got to thinkin i might be pregnant, so i read the symptoms. i started feeling sick to my stomach, like if i ate i would throw up, but never did. i started my period april 11. it lasted for 6 days. after my period ended my breasts hurt for about 2 days, i had headaches(i think they were sinus headaches), and when i had a headache i would be somewhat light headed. i only had the symptoms when i thought about it..do i sound like i may be pregnant? or is it all in my head?