My wife's period cycle is 28-30 days.in october she got period on 12 i.e. 12 oct. Then we has sex on 22oct. I ejaculated inside her. She missed her period of november, today is 29th oct still she didn't get any periods. We did pregnancy test 3-4 times after missed period (with gap of 5 days each) but all test (urine) came negative. So far she always had periods on time. This time only she missed. Is she pregnant or not?