How To Confirm Pregnancy?

ive been on irth control pills since the end of aug. never forgotten to take a pill. well my husband came home nov 21st we had sex that night. i started my period nov 23rd til that sunday night. we had sex sunday night then the 30th dec 1st 2nd & 3rd. he went back to korea early mornin on 4th. well on the 4th my boobs started tinglin i was feelin nauseas & very tired.this continued the nxt few days plus peein more like every 10 mins. even more tired. started havin lower belly cramps still do. & my lower back has been hurtin the whole time & now my hips r too. im more nauseas off & on thruout the day. i get headaches. im startin to crave things. things i usually eat r startin to make me very nauseas. i already have 2 kids my youngest just turned 1 in sept. i had a d/c lap in june for endometriosis. which wasnt as bad as they thought. o & for the last 3 days ive had a pinching feeling around my ovaries & keep gettin very dizzy. so i was wondering is it possible im pregnant again? or what could this be?