I've noticed that my period has been longer than usual, lasting up to 10 days, and I took a pregnancy test but it came back negative. Then, I experienced very light bleeding mixed with a watery discharge for a couple of days. Lately, I've been dealing with a pretty bad pain on my right side and it's affecting my back too. I'm really concerned and would love to get some advice on what might be going on and what I should do next. Any thoughts?