Implantation or AF?

Mariah • I am 23 years old, I have been with my boyfriend for four years. We have one wonderful son together he will be three on Febuary . We are just trying to expand and maybe get a little girl in the mix
Yesterday I started bleeding brown/red color. I only used one tampon yesterday. Today same ordeal, it covers the tip of the tampon maybe and I have no cramping . My actual period wasnt due until December 8th. So it came (assuming its a period ) five days early . Any one experience something similar?