why do I feel this way???

I'm 8 wks along with my second child. This was a planned pregnancy. My husband and I got lucky on the first week of trying ! I should be over the moon but I'm not. I have some health issues so I just assumed we would have to try for a while or just not be able to conceive. I also had some issues while I was pregnant with my first. I just have so many emotions. I'm worried if the baby will be healthy? Will I be healthy? how can I love a child as much as I love my first child? I want so badly to be excited and happy but I feel worried . I don't think I'll find relief until I get my second trimester screening to rule out any horrible things. I just want to be positive and happy but I'm not I feel like an horrible mother. I should be thanking god and grateful . I just feel so alone in my thoughts I don't want to tell any family or friends . Please help any advise 

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