spotting on nexplanon

Til

okay so ive been spotting off and on for the past couple of days. it’s been dark red to light red to brown. i started spotting monday after my boyfriend and i had sex and it’ll come and go. i thought it was over today and i had sex w my boyfriend and it’s back... then an hour of two later it stopped and we had sex again... i come home and about an hour ago i start spotting again. is this normal with nexplanon???