Pregnancy and Parenting

Glad tidings in the mubaarak Ahaadith for a lady who had a miscarriage

Q:

1. I had a missed miscarriage at 8 and half weeks of pregnancy. I conceived at a late stage as I was blessed with nikaah much later in my life. I am much devastated with the miscarriage.

My question is, will the miscarried foetus go to heaven or it never existed (as if there was no rooh in it)?

2. Furthermore, I had a dnc done but after three weeks post procedure I'm still bleeding. Please advise on the process for salaah and Quraan. 

Authenticity of a hadith regarding duas being accepted during childbirth/labour

Q: I came across some information a few years ago, which I don't remember the source. I am now pregnant alhamdulilah and I would like to verify this information as I cannot find anything in my Islamic literature.

Is true that dua is accepted during childbirth/labour? If so, please can you provide any basis.

Child remaining in the womb of the mother for more than 9 months

Q: In Behishti zewar theres one masala that states that if a husband passes away and then after a year the lady gives birth to a child, it will be attributed to him (she didnt get married again at all after his passing). Conception happens a few days as afterwards the nutfah dies and conception is only 9 to 10 months.

Is it normal for a mother to carry an offspring for 12 months?