pink spotting and now brown discharge cycle day 15-19

I've been ttc for almost two years now. I have my first fertility appointment the 27th, fingers crossed. I typically have a normal cycle of 27/28 days with some spotting before I get af. This time starting cycle day 15 (April 6th) I started getting light pink spotting and it lasted on and off till yesterday (cycle day 19), I got brown discharge and I still have a mix of brown and pink discharge today. Anyone else have this issue? Is it my period just showing up early? Or any advice? Thanks for the help ladies