very heavy period 7 days Earlier than expected?

Hi, it's my first post on here so I hope I'm doing things right. So I had the implant out on the 27th august. I bled lightly for two days. I then had a normal period on 29th September. I then started another period 4 days ago and it's PAINFUL and so heavy. Bleeding through super tampax and pads within an hour and full of clots (sorry for the images that's giving). Not using any other contraceptive and having sex 2-3 times a week. Anyone else experienced this or have any advice on why this could be happening? Thanks in advance :)