nexplanon bled after sex

Til

okay so i had a period it was a solid week, if not more. i stopped bleeding for at the end of the night and didn’t bleed the next morning. i went over to his house, we had sex maybe 1 or 2 times and an hour later i bled a little bit and continued to bleed, so i guess my period wasn’t done then. it stopped for a day and a half my boyfriend and i went to the beach (there was some brown discharge but i didn’t think much of it), we had sex twice and i bled on him, the second time! so the bleeding stopped later that night. he came over last night and we had sex 2 times, and i bled after again. is this just because i am on nexplanon????? because of the irregular bleeding or what???

PLEASE HELP WE ARE WORRIED!