Mom guilt

So I just found out Im pregnant with my 3rd. I wasn’t planning on having another baby until next year, and Im currently feeling so much guilt. To better explain my oldest (4) is just getting better with her speech and finally progressing to full sentences. While my current youngest (2) has a few medical issues. He has sever eczema and list of allergies that I wanted to have a better grasp on before having another. And now I just feel as though im failing them by adding another into the mix. Has anyone felt this way?