Surprise! Closely Spaced baby #2!

Hi everyone, I just turned 33 years old a few days ago and my baby boy just turned four months on the ninth of this month. I just found out that I am pregnant again! I am super scared, and wondering if this is at all dangerous because of the close spacing. We had planned to start trying again around my sons first birthday (October) but now this second baby is due a week after my son's first birthday. Does anyone have any experience with such closely spaced kids? If so, can you offer any advice for me? Thanks!