I had sex on the first day of my period last month, my period was 4 days long and my cycle is 34 days. It is the next month now and I am 3 days late for my period ( it is always regular, 34 days exact) is there any chance I could be pregnant? I mean is it even possible with a long cycle like that to fall pregnant on my period. Had anyone fallen pregnant on their period before and that to on the first day opposed to the end of it.