Nervous...

I'm newly pregnant with my second baby. I lost my first baby, a daughter, at 30 weeks. My emotions are very mixed...although i feel like my daughter sent me this beautiful blessing, i am nervous that this baby will not make it. This entire pregnancy feels different for me. My partner and our families are all overjoyed to even get the first ultrasound, but i am terrified because the last ultrasound i had came bearing life changing news...i guess my question is, has anyone else gone through this/are they feeling this as well? I know it must be normal, i just would like some tips on getting over nerves if anyone has them.