Period!

So my last few cycles I’ve been very very light! I’m usually extremely heavy going through super + every 20-40 minutes. But toward the end of my cycle I’ve been discharging like crazy which isn’t normal for me. It’s super runny and almost watery! I have no idea what that could be!!! Or why it’s been happening. I just got the IUD again back in July after being on Nexplanon and having a horrible experience!! Any ideas ladies????