Depressed!

Long story short i have a 4 year old and a 4 month old i found out im 3 months pregnant after my depo shot appearantly did not work 🤬 im going nuts i dont want this baby yet i dnt have the heart to do anything like an aboortion. I feel so down and its not fair for my 4 year old and 4 month old im always mad or just crying i dnt know what to do i feel lile im going to go crazy sorry needed to vent !