Chance of pregnancy?

My lmp was the 27th of December to the 3rd of January.

I had sex the 6th,7th and the 8th (it was the night of the 7th but it was about 1AM).

The guy pulled out the 6th and 7th but finished inside the 8th.

I’m 6 weeks postpartum and not breastfeeding.

I got nexplanon the 8th (around 3pm).

What are the chances I’ll get pregnant from it?

Please don’t be rude. I told him to use a condom and he wouldn’t so I told him to pull out and he didn’t.