22 weeks pregnant and eat very unhealthy.

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I am 22 weeks pregnant with a wonderful baby boy. I work a full time job and don’t always feel like cooking before work or after. I have been eating a lot of fast food and takeout. I know it’s not good to do that, but I’ve just been researching and worried myself a bit. Is 22 weeks too far in that if I changed my diet it would be for the better? Or is the damage already done?