Worried about depression 😔

Ive suffered with depression in the past and im terrified of suffering with it during / after this pregnancy. Ive been under alot of stress lately my middle boy has autism and has been a handful this week and my brother in law was rushed in to hospital by my hisband and turns out hes suffered 2 heartattacks in a space of a few days hes now stable. I also had a call on saturday to say my grandad had died and my grandma is in hospital. We suffered a missed misscarriage in april, can safely say im at my witts end! I cant stop crying or feeling down 😟 i need to find ways to be positive but im stuggling! Thanks for reading ladies!