Pregnant with second baby with a toddler

I just want to ask for advice on how to deal with my toddler emotions

I know he can sense that I’m pregnant and has really been whining and on top of that been refusing nap time. I have tried to bond with him and do little dances and sing with him along with pretend play. But through it all he just whines. Yes he does have a cold which I’m giving him cold meds to make him comfortable and warm baths. But I just really need some advice on what else can I do to help calm him.