Unplanned pregnancy and upset baby #5

I just found out I’m pregnant with my #5 baby I have 4 living 2 boys 2 girls . 9yr,7yr,2.5yr and 14 months. I just found out I’m pregnant after I got my iud out due to it perforated my uterus I got put on the pill right away while on my period well 3 weeks later I found out I was pregnant. And all my other kids were pretty much planned or at minimum planned for some time in the near future. I thought we were done and I work part time. I guess a part of me want the baby cause obviously for some reason the universe wanted me to have another baby but half of me is saying I’m not ready my kids are to young my other ones need me. My 2.5 year old is also significantly developmental delayed in expressive speech he only says 2 words possible autism so that’s a lot on my plate to . I mean we do speech a couple times a week and between all my kids my life is hectic and crazy . With all my other kids the moment I found out I was excited shared the news . This pregnancy I feel sad and guilty for being sad and not excited. I’m scared to tell my other family and definitely scared to tell my work I feel like a joke in some aspect. And I don’t like feeling this way but I’m honestly scared of how this baby would take away from my other kids , scared cause my 2.5 yr old needs me very hands on . Just in general scared and anxious and then guilty about feeling this way. I just needed to vent and see if anyone else feels this way if it’s normal and have you overcome this feeling? This is new ground for me