ladies please help me ease my chaotic mind..lost my bf to drugs now this..

my boy Izzy who is 6 yrs old, is my pride and joy.

He is my first child with my first bf who we lost to drugs 4 years back. it was heart wrenching but with the grace of god I found love again and I'm now with the love of my life of two years, after a long year of TTC I'm so excited to announce that i finally got my BFP and im 9 weeks.

so everything is beautiful right now but if course panic sets in and the reason being...im just hoping that my Lil one doesn't feel looked over after this baby arrives. My S/O is amazing and he and his family adore my son but I fear with his own child coming around Izzy will feel left out because his dad isn't around. Im so over thinking it and I know my S/O is gonna be equal with the both of them..any other ladies on their second child with another man and ever worried about the same thing? or been in this situation before and worked beautifully in their lives?