Girls, question for those who have more than two births. What if I had…

Girls, question for those who have more than two births. What if I had two births, the third birth was a miscarriage at late term and I gave birth to a son naturally... Is this also considered a birth? Like that, it was my first question. And now the second, is there a chance that these births could start earlier than usual? In general, I've given birth in 38 and 37 weeks. How would it be not too long but I carry children. Tomorrow I will be 34 weeks, there are no complications, the cervix was normal on ultrasound, water is normal and 1 cup. The baby is ahead by two weeks in size. In general, experienced multi-child mothers, share