Should I retest?

Hi mummies, Earlier this week, on Monday, I used normal clear blue pregnancy test in the evening. It indicated faint positive. When I checked on Tuesday morning, it indicated as negative. Yesterday, I tried to test on digital clear blue in the evening. It indicated as "pregnancy 2-3 weeks". Is it mean than that I'm 2-3 weeks pregnant? If so, how come it was faint positive on Monday? Do I need test again to confirm my pregnancy? My upcoming appointment with gynae is mid-feb. Should I wait? Thanks for your advice ❤️#pleasehelp #advicepls