Ummm HELP

Okay so I’ve always had irregular periods until the past year or so. I’ve been completely on cycle. I have a 4 year old. I’m not on birth control and I am married but things aren’t really going well. I stress ALOT. so last month my period seemed to be about a week late. It did start and it was normal. This month it’s calculated as 2 weeks late. We are on the way to a friends house and I’m having sharp pains. Like needles stabbing me in the twat! Sorry!! Plz help