Feel like giving up! 😓😢

My baby was just born Sunday night at about 11:05 pm. I feel so terrible i dont have a flood of milk coming in for her im about ready to run out for some formula!! I always said i would stick to EBF regardless of how hard it was but the guilt of her not being full is something else 😞 i have plenty of colostrum and she pees and poops regularly more than i thought she would but i still feel like she isnt getting what she wants. Any adivce or input?? When did your milk come in?