is it working?

Alondra • Too blessed to be stressed | 18
I've had the nexplanon for about a month now and it was inserted while i still had my period. After my usual five days with Flo i started having a lot of brown spotting and when i had sex it would get red (the blood). Now i dont have any spotting at all. Is this normal? Is it working? Plus i can feel it on my arm.