Emotional about baby #2

I never went back on birth control after having my son in 2017, hubby and I were open to getting pregnant whenever. My son is still breastfeeding at 25 months so my cycle has been irregular, I thought I would have been pregnant a year ago, so the last year of waiting for that BFP was so hard on me. Now I got my BFP and I feel soooo emotional, like my son isn’t ready for the big change, like I’m being selfish, his whole world will be flipped upside down. I feel like we’ve made a mistake. But I wanted this soooo badly right until I got a positive result. Every time AF showed or I got a negative I would cry and be depressed for days. Anyone else experience this? I’ll eventually wrap my head around it and get excited about this pregnancy right?? My son will be 2 months shy of 3 when new arrival shows up.