why did i randomly bleed?

Davina

so i bled the other night and thought i started my period but i pulled out 3 dry tampons after that. i do have unprotected sex with my boyfriend and he doesnt always pull out bc i have the nexplanon implant. im a little concerned it may be implantation bleeding but it may also just be that my periods are irregular. has anyone else ever had this happen to them while on the implant??