I'm so confused please help... anyone

My last period started December 1st. And my period was supposed to start again on the first of January. It didn't. And it still hasn't came .. I did have a pregnancy test come back positive around the end of December but it was faint as hell. Please help me if you can. Idk what to do. Every time I put my period is late on glow , it just moves my expected period forward a few days .