Its now 6 years of marriage, still have questions on my period cycle

dayDream

so ever since i started sleeping with my boyfriend, i have been having irregular cycle-meaning i can have my period in the beginning of the month and almost at the end of the month. And then there are times when I skip a month then I thought I am pregnant then comes the next month I have my period. And now it is 6 years of being with my man, but I am not pregnant yet! Could it be we have different Blood, because i am an O and he is A(blood type)? Please help !

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