Nexplanon

Got on the implant about 3 days ago and I’ve already noticed some discharge. I was spotting when I got on it and now it’s definitely close to being gone and I still wear panty liners in case. Anyway, instead of old brown blood, I’m noticing a faint yellow color on the panty liners and I’m wondering if this is discharge because of the implant. I’ve never had my discharge be noticeable like this on a pad but i also know I don’t have an infection

Also, I’ve recently needed to take a plan b so could that be the reason my discharge is like this or is it the implant or a mixture of both?