Going on 5 years!

I need to vent, my heart is breaking. With our son we didn’t plan it but it happened. We always said we wanted our kids close together. We’ve been together 9 years & married almost 3 December 27th. We’ve been trying to have a baby for almost 5 years now!!! We wanted one a year after our son was born & he’s almost 6! I’ve had 2 miscarriages and I just feel like it will never happen. We have spent so much on every pregnancy test possible every month just waiting on those 2 pink lines but nothing. Everytime I get on social media someone announces their pregnant & it’s rips my heart out. We are beyond thankful for our son, & now he’s even getting to where he asks for siblings because he’s always alone. I feel like it will never happen & it send me into depression... so could you please keep me in your prayers. I just don’t know what to do ...