*in need of help, no period for 2 months??

hello everyone of steadyhealth forums, i am an 18 yr old female and i have been worrying about my well being, i have been having unprotected sex with my husband for 8 months now, YES I JUST GOT MARRIED IN APRIL OF 2006, now i was wondering if anyone can hear me out and help me figure out what is going on with me... first off, we have been having unprotected sex for 8 months, i have had my menses on a regular cycle but for some odd reason i cant recall if i have recieved my period on aug. usually i jot my menses down on a calender, but aug. wasnt filled in... so if i'm not mistaken i probably did not recieve it. now it is sept 2006 and i have not recieve my menses this month usually i'd get it on the 11th or 12th of every month. its very odd i have taken a pregnancy test last month in aug. it was negative. no possible way of me being pregnant my husband is in the military he was gone for most of aug. he left to texas on aug.30th and he just came back sept 8th of course had sex and then he had to leave again on sept.13th again NO PERIOD HAS SHOWN UP.. last we had sex was on the 12/13 but im not sure if me still not having my period for 2 months would i still be able to OVULATE WITH NO PERIOD? if so is there a possibility of getting pregnant with no menstrual for two months? i kind of feel akward since yesterday like something is not right with my body. and i dont take bcp (birth control pills) or any form of contraceptives. although my husband wouldnt be suprised if we get pregnant with in now or anytime later, due to us never pulling out or using contraceptives... so am i just being paranoid or is there a slight chance i could be pregnant? i know its too soon to tell but a bit of information would help if possible, i not only been feeling akward but i been sleepy alot more...i know more exaustion should kick in later in pregnancy but i been getting more then 10hour rest and i been eating alot more and i would have the need to throw up but it wouldnt come out...i get very nausiated for a short time and i get dizzy when i move around like sitting down so fast or flopping myself on the couch or the bed... it hurts like as if your brain is shaking all over inside your skull... i know that sounds sick, my breast does not feel tender but it hurts if i were to touch it my nipples tingle a bit and my lower back hurts alot! so can anyone please tell me what they think is going on?