Im really worried that i am pregnant. is there a chance i might be plz read inf and answer.?

ok well i had unprotected on saturday. i have been on birth control for about tow or three months. we only had for about 5 mins or less. he did not fully . but there might have been some pre. i took a test on tuesday and another one today. they both came out negative. what are the chances that i could be pregnant? i havent really had much sleep since that day(im not sure why i havent been able to sleep) I WAS ON MY PERIOD WHEN I HAD .. ill go to sleep for a couple hours then wake up and not be able to go back to sleep. do you guys think i am preganat or does birth control eliminate that possibility?