Preemie milestones

Kayla • Wife and a momma to 1 princess and 1 angel in heaven and my rainbow baby.
Even though my daughter was barely a preemie (36W), I'm wondering if she will follow the preemie milestone timeline or the full term? She's 1.5months and she's only smiled once and doesn't coo or anything and only started looking around yesterday. According to "the charts" she should have been doing it already. I know every baby is different.