Diet change and heavy bleeding

Brogan
Ok, so in the last two months I've managed to transition from a heavy meat eater and junk food consumer to a healthy vegetarian/mostly vegan. (Also lost 1.5 stone woohoo!) BUT in the last month I've also had 3 periods!! Lasting about 4-5 days. I got the nexplanon implant in September and never had any bleeding at all until June. I know it doesn't suit all people and you will say take it out and try something different but seriously it's the only one I can have unless I just used condoms, which I don't trust. Has anyone experienced this with either a diet change or the nexplanon? Thanks girlies 🤘🏼