Light pink discharge?

This may be legnthy so bear with me. Im almost 3 months post partum. At 6 weeks I started Micronor as my bc. I ended up missing two days worth of the pill due to a last minute trip out of town for a family emergency. I called my OBGYN & explained the situation. They told me i would have to wait and start a new cycle of bc after my next period. Since then I have been tracking my cycle and trying to be extra careful. According to this app i should of ovulated on the 23rd, but i think i ovulated on the 26th. Hubby and I had sex on the 25th & when he pulled out the condom had came off inside me. When i went to the restroom earlier I noticed light pink discharge on the tissue paper. Would this be ovulation or implantation bleeding? Im not due for my period until Jan 8th & I dont normally spot between periods. Im adding a pic of my chart.