Need opinions please :)

Melissa • My husband and I were blessed on November 19 2015 with our son Nolan! Currently pregnant with baby #2 👨‍👩‍👧‍👦
I've started to plan my sons first birthday party his birthday is November 19th (it falls on a Saturday which is perfect) I'm also pregnant and due to have our next son December 11th. So my question is is 3 weeks before my due date enough time to plan his first birthday? I would really perfer not to have his party before him actually birthday. 
What do you guys think?