Hi losingit
You seem to be a great mother.
You care and want the best for your children. Go on with this attitude.
Of course, on your shoulders lies a lot of responsibility. This gives you worrysome thoughts and feelings.
We all might one day or the other think about death. Some are really afraid of death. Especially as we come from a JW background and believed about endless life in a paradise, it can be depressing not to know what comes after death.
I can tell you what took my fear of death. I read a lot of accounts about "near death experiences." After reading a lot of personal near death experiences I am not afraid anymore. In fact I really believe now that there is a "personal" creator, god, force of life or whatever you call him. It convinced me that this god is all encompassing unconditional love and he wants us just to show love and compassion in our life. And he cares for you and your children. A heart moving experience of a little boy (Colton) you can read in his account in the book "Heaven is for real" by his father Todd Burpo.
Even though I lost my religion (JW) I didn't loose my faith. I pray to and thank my creator, just in a different way than before as a JW.
I wish you all the best for the rest of your pregnancy. Try to calm down and relax.