Feel like a bad "mom" today

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I am 7 1/2 weeks...... and I feel MISERABLE.  My morning sickness is 24/7 (and I have zofran now to help me).  I am constipated (and am taking miramax to try and loosen things up).  I am just feeling awful physically.

 

But I feel like a bad "mom", because if this baby doesn't stick, then I will not be getting pregnant again, I just feel to sick and miserable, and I think I am losing my head.  I know that sounds awful, and I feel awful saying it, but I feel like I just don't want to do this anymore.  I am losing it.