Is this normal??

Hi I’m a 19 year old and I am on the nexplenon implant and I still get my period but the weird thing is my period doesn’t flow. I noticed it about 2 years ago and thought it was weird but I didn’t think much of it. So I don’t where a pad or tampon most of the time during the day and I don’t leak but as soon as I get ready for bed I put a tampon in and I have to take it right back out because it’s soaked from everything that isn’t coming out and I’m really confused?? What’s going on