Relationship after baby

TMI

No pictures

So......

We had our baby boy on 6/1/18, but like every new parent didn’t get much sleep for quite a while. Baby boy was in our room until his first birthday.

Hubby and I were finally intimate again this past week. A day after my predicted ovulation. I’ve had slight pinkish tint to my discharge yesterday and today. Is this just because it was the first sex since baby? (I’m just worried that it could potentially be implantation bleeding, as we only used withdrawal method)

TIA