Implantaion bleeding?

So i have been ttc for 1 year now with PCOS which makes it really hard to calculate ovulation or when my next peirod will come (or even if it will come or if i have to use provera) according to the glow app and my absolute best efforts at ovulation detecting i am 18 days late (keep in mind the data is kinda iffy because of the pcos) but this morning i thought i had started my period. I put a pad on and went about my day about 6 hours later i went to go to thw bathroom and my pad is completely clean. Then this evening nothing in my underwear but when i wiped the lightest pink discharge is on the toilet paper... And then nothing! Is this possible implantion bleeding or could it be my period starting?

The first image is my own. The second is a screenshot of a thread i found where the woman was acctually pregnant after this occured. It looks very similar to me. What do you think?😬