So long as it’s read within 5-10s and you saw 2 lines it’s positive. To know how many weeks you will need to know your last menstrual date. You can use this calculator. https://www.whattoexpect.com/due-date-calculator/ Anyway suggest you to visit gynae to confirm your pregnancy.
You are pregnant. Congrats. You can roughly count the weeks from the first day of your last menstrual period.