What Causes Change In Vaginal Discharge From Brown To Yellowish?

Over the last few weeks, i have been having a lot of changes in my vaginal discharge, from brown to yellowish and sticky/stringy. there have been no other syptoms, and i have had STI testing done, just incase and everything came back negative. But this is not normal for my body. I have gone back on the pill, it's been 9 months, i had someone suggest that it was my body reacting to it, but it's the same one i was on years ago.



my libido has been much higher lately, but I have not been having any sex.



I don't know what to think right now, can anyone help me?