what would you moms think

Mommieof✌🏼👧🏻👶🏼
So me and s/o had sex sept 15 & sept 21&25 but those two days he pulled out I received my period sept 27 a 7 day period and I had blood work done oct 12 showing negative should I be on the clear to go get my nexplanon have not had sex ever since those days ? Or was the blood work done to early ?