Depression during pregnancy

When is saddness, hopelessness and the whole i dont give a f^^k feeling become an issue to talk to my OB about? First it was on and old but more and more its been constant.

Please dont misunderstand....i love mt baby boy (preg 23wks) but sometimes i wonder if i made a kistake by having him. My dh and i tried for 2yrs before conceiving him. I think about all the things we probably wont be able to give him. We are not poor but we could be doing better. I think about how much is going to change by having him. I wondee if ill be horrible neglectful parents like both my brothers. I think to myself "how the hell and i going to do this?" I feel so overwhelmed at the same time i think well hell what do i have to complain about? But that makes me feel worse.

In dec i was in a bad car wreck and i am still dealing with the aches and pains that resulted in it.

Am i alone feeling this way? Will it go away or should i tell me doctor.