Weird period!?

My periods usually last about 6 days and are pretty regular, usually a day or two before the prediction on here.

This month I started last Thursday and had a day with a lot of brown old blood then the following day (yesterday) it was bright red again and then today a little more brown in the morning and it’s been pink tinted discharge kind of stuff and some brown blood on my pad.

I’ve never had my period go past 7 days and never back and forth from fresh blood to old blood.

Any ideas of what could be causing this or if it’s normal?

I have had the possibility of getting pregnant again on my brain for about a month now.

(Unrelated: I’ve had “phantom kicks for about a month here and there, my son is 1.5 years old now!)