That lmp doesnt work if your iregular
Whoops I mean that's what they do to find due date. Do the opposite for what you're asking...
Take the first day one your lmp subtract four months, add seven days. That's what all calculators and doctors do.
The doc will also guesstimate
Google conception calculator
That is when ur egg will have met the sperm but sperm can survive in ur body for up to 7 days so if u had sex up to 7 days before Jan 27th it would have survived. To know ur due date u just need to know ur lmp
The app on here let's to go by the 1st day of ur last menstrual date and tells you the beginning and end date.also baby center does it! Online.
The app on her let's to go by the 1st day of ur last menstrual date and tells you the beginning band end date
That is when ur egg will have met the sperm but sperm can survive in ur body for up to 7 days so if u had sex up to 7 days before Jan 27th it would have survived. To know ur due date u just need to know ur lmp