How likely is it to be pregnant???


So we always have sex around the time I’ve finished or just about to start my period just to be a bit more cautious. I’m confused as to why I’m late, out of all the times I’ve had a pregnancy scare this has been the least likely. Yes of course stress is a factor but it has never made my period late. I’m just very confused as to why...? I would be either 5 weeks in or less than a week. And I feel like at 5 weeks you’ll probably feel stuff going on