Beta, positive pregnancy tests are very rarely wrong. Take rest, drink some warm ginger water if you feel heavy, and visit your doctor soon to get the official confirmation.
My mother told me to wait for a few days and test again with the first morning urine to be sure. But to be 100% certain, it is always best to visit your gynecologist for a scan.
I know exactly how nerve-wracking it is to stare at those lines and keep doubting them. Take a deep breath, a positive is almost always correct, but visiting your doctor will give you the real peace of mind you need.
False positives on a test are actually extremely rare. If you are feeling slight nausea or other symptoms, you are most likely pregnant. I suggest booking a quick blood test at the clinic to be absolutely sure.
Just buy another cheap test kit from a different brand and do it tomorrow morning with your first urine. It is an easy way to double-check before you book a doctor's appointment.