So I took a clear blue pregnant test where it also provides the weeks...
To my surprise I'm 2-3 weeks pregnant is this accurate or should I be adding weeks? I'm a little confused!

They are pretty accurate, but a visit to your doctor with your LMP is more accurate. An ultrasound will be done providing the best accuracy.

They are good, and of course it is always give or take a week or so. No testing is exact on number of weeks. They are based on averages and percentages.