Positive test

Hello everyone. I went off birth control earlier this year and my husband and I have been TTC. I just took a pregnancy test today and it came out positive. Took it in the morning with the first morning urine. We had sex 2.5 weeks ago during my fertile window, and I am only a day late with my period so far. This would be my first baby. I really don't feel any different other than missing my period. I felt a bit crampy a few days ago but it passed. My temps continue to remain high though. When should I wait to take another one, and how many should I take before I call my doctor to make an appointment? I am scared that this is a false positive so I don't want to celebrate too early. Any advice is appreciated!