help

My last Period was December 17-21 2024, but this January I had my period on January 20, but it only lasted for one day, and that was the first and last time I had my period in January. In February, around February 11, when I went to urinate, I saw some red watery discharge. I became anxious because I hadn't had a real period yet, so my boyfriend and I took a pregnancy test four times, and all tests came out negative. This March, my period was supposed to come on the 17th, but it still hasn't come. What could be the possible problem?