Adjusting with second child

I found out I’m about a month pregnant. My boyfriend and I have been together for 10 years and have a 4 year old. We always said we only wanted one child but then when I found out I was pregnant we didn’t know what to do. But we talked tonight and decided that there’s a reason I got pregnant even though we used protection so we decided to keep going with the pregnancy.

I’m just curious how hard it was to adjust from one child to two. How did your toddler react? My son is a VERY hyper child that at times he can be very overwhelming, is it true that they usually calm down when the second child comes into their life? Also we live in a two bedroom apartment. Is it going to be impossible to have two children in a one bedroom? Should I be looking for a 3 bedroom? I’m just so worried and nervous especially with how my son will feel.