Irregular period month after Plan B??

Ruby • God 1st ✨| Lani’s mommy 👶🏽💕| J.O 💍| 21 | KU 📚 𝐸𝓋𝑜𝓁𝓋𝒾𝓃𝑔 🐛...🦋

I took a plan B on January 23rd. I got my “period” ( or at least I think it was) a week earlier than I was supposed to. I logged it in and the app said that my period should of came this past Monday but it hasn’t. Could my early bleeding could have been implantation?? It started off brown then got heavier and red. But it was still was lighter than usual I believe. I have veryyy mild cramps right now. Does this just mean my cycle is just going back to its regular scheduling being that my period started early last month? So now it’s just going back to how it was supposed to be if my period started the expected time last month? Also I took a test and it came negative but that was earlier on in the month after my early “period”. I was feeling weird during “ovulation” week.