16 days, no period on Nexplanon but VERY light spotting

So I’m 16 days late now, I have Nexplanon but I’m bloated and spotting so lightly, I only notice it after I pee and wipe. My fiancé and I have unprotected sex a lot due to any type of condom irritating my skin however, this spotting has been happening for three days now and thankfully, it’s been getting lighter but I’m concerned. I’ll be going to the doctors tomorrow but I’ve been noting all these things; spotting, I’m always hungry but I still cannot eat much, I’m just worried about what’s going on. Any suggestions?