Spotting Question

Hi everybody..

I have a question, I was wondering if any of the glow community can help me with..

So I got my period on the 21st and it ended on the 26th as usual. My fiancee and I had sex on the 26th. On the 27th, I noticed some bright pink/red spotting. On the 28th-nothing, and we had sex again. On the 29th, some pink/brown spotting. Its nothing heavy.. mostly apparent when I wipe.

This is very unusual for me, spotting has never happened before from menstruation or sex. Im also not on any birth control.

I used to abuse birth control pills to stop my periods, but I stopped taking pills altogether for the past 7 months and am ttc. It took a while for my menstrual cycle to find its balance again but My period is regular and has been coming exactly when expected for the past 3 months.

Anyway, sorry for the long post. Im just trying to give as much relevant info as I can.

So does anyone know... WHY THE HECK AM I SPOTTING :/