Pregnant 5.5 months PP

So I just found out this morning that I’m pregnant and my baby is only 5.5 months old. It wasn’t planned so my husband and I are both in shock and I don’t know how to feel. I’m nervous and scared and everything. Anyone in this boat or dealt with this?? Any advice? Words to help?? This would be our 4th child and I’m 38 years old. Thanks!