Implantation Bleeding?

Dorothy

Hello! Sorry if this question has been asked a million times!

I am currently 9 dpo- yesterday (8dpo) I had a slight cramp in my lower stomach for maybe 5-10 min mid morning- later in the afternoon my partner and I had sex - afterwards I had a small amount of spotting, only when I wiped right after sex - spotting did not continue after that.

My period is due Saturday 22nd.

Could this be implantation bleeding?