Im severly depressed about possibly being pregnant again and need some reurance that its all going to be ok?

So my husband and i were TOTALLY done having kids...financially, mentally, etc...we are both young still and have three kids under 6...we wanted our family young, and we HAD a decent life and were DONE having kids and waiting for his vasectomy appt to arrive. Well, now, im really late with my period, havent taken a test yet, but i know im probably pregnant, ive been pregnant 3 times before lol. My family is PISSED that i could be, i know my obgyn is going to be mad because im still paying off the bill for the last pregnancy, and she said i dont need to have any more kids after i had my third (which upset me)my husband is laid off work, we HAD a GREAT LIFE financially now all is going to hell...and i didn't want another baby, we even rarely had and were sooo careful when we did just so that i wouldn't get preg. since he was getting snipped. I dont know what to do, no i will NOT get an abortion nor is adoption ever an option.. i will do what i have to do and keep this child.. but its really hard knowing that no one in my family no doctors, nothing would even be happy for me at all. We already get dirty looks in public having three kids, and now if im pregnant again?! Ugh...im just severely depressed...please any advice to make me feel any better?