I started my period on the 19th August 2016 and they have varied but I normally always have one at the end of the month, I think it may be stress but I’m not sure. I been getting stomach ache. For the past few months I’ve had two periods I think that might be why I’m late but I’m not sure. I had dry sex on the first week of this month and last weekend,I don’t think I’m pregnant. But please help