1st period back?

Bronte

I am 15 weeks pp and I have had no period or bleeding since 5 weeks. So 2 days ago I started spotting only in am very very light, yesterday mid morning light/medium, and today medium spotting.(nothing enough for a tampon or pad, just when I wipe.

I’m confused as to is this a period or is it implantation bleeding?! If we’re pregnant again it’s all good but I’m not sure because my periods are usually heavy

Symptoms are light cramping, and headaches