Debating on #3 HELP!!!!

So I'm really debating on having another baby. My friend has 2 and they are WILD and crazy! She just found out she was pregnant too. It's making me second guess having another one. Hers are 18m apart. My son is currently 16m and my husband brought up baby no 3. I'm a SAHM. My oldest is about to be 9 LOVE the age difference makes my life easier lol my youngest is a very good baby compared to the ones I've been around. Just wondering how different and hard having a toddler is with being pregnant and having a newborn. Pros and cons? Is there a certain age you thought was best or wish you waited to?

Please and thanks!!!