Baby ok

Sarah
Hi my name is Sarah and I am pregnant with baby # 6 but only have 3 kids. Ages 15,12,16 months. We have been married for 11 years. We lost 2 babies in 2 years than gave up and thats when baby 3 came with a 10 year gap. So were a little scared to make sure that this baby is ok. What can we do to find out