Becoming pregnant again is a huge mental adjustment even when you are hoping and planning for it, so it's no wonder you're feeling surprised and overwhelmed and a little conflicted about the whole thing right now. Don't feel bad about it.

I didn't feel ready really to have DD4 when she came along. The last part of my pregnancy with DD3 was kind of rough for me, and I was enjoying my "non-pregnant" break (although we did certainly want more babies, so not the same situation as you, I know) when the test turned positive. I was happy, but also really feeling like "I'm not ready yet!!!" It took a few weeks for me to get excited about having another one. But by the time I was 10 weeks or so, I was feeling nothing but joy and excitement, and now that she's here, we couldn't imagine life without her. We love her to bits.

I hope you find yourself feeling the same way soon - less shocked and overwhelmed (along with happy) and just excited to meet one more little person to love and teach and enjoy. I hope your DH is a wonderful supportive man and that he'll be there to listen and sympathise with your feelings right now, and help you work through it.

Wishing you all the best with this pregnancy!