As I recently read: pregnancy is a hope, not a promise. Yes, loss is scary, but apart from being as fit and healthy as you can be, there ain't much you can do to stop it.
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This is what my sisters and I were brought up being told too, and I believe it is very true. My mum had 10 pregnancies for 5 children, and her sisters all had a very similar history, including a beautiful SIDS baby. My older sister has had 5 pregnancies (including a twin loss at 16 weeks) and now has 2 children. My other sister has been ttc for almost 8 years. I have had 2 pregnancies resulting in 3 children, and I am thankful for this everyday.