My period is brown !

Hi I’ve been really worried lately about my period and need some advice... my period came a whole week late but when it came it was super brown and light .. for me that’s super normal because I understand that it is d blood but I’m on the fourth day of my period and it’s still super light and brown! That’s not normal for me , I usually have a really heavy flow by the third day ... is this normal ? Should I be worried? Or can I be pregnant ?