There is always a chance ur baby will be fine! But there is always the chance of it having Trisomy. Make sure u let ur doc know about baby daddy so they can do all the test to make sure ir baby is ok! Good luck and congrats!
Talk to the doc about the Trisomy 13 issue. Here is from the National Institutes for Health:
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Trisomy 13 (also called Patau syndrome) is a genetic disorder in which a person has three copies of genetic material from chromosome 13, instead of the usual two copies. Rarely, the extra material may be attached to another chromosome (translocation).
Trisomy 13 occurs when extra DNA from chromosome 13 appears in some or all of the body's cells.
Trisomy 13 -- the presence of an extra (third) chromosome 13 in all of the cells.
Trisomy 13 mosaicism -- the presence of an extra chromosome 13 in some of the cells.
Partial trisomy -- the presence of a part of an extra chromosome 13 in the cells.
The extra material interferes with normal development.
Trisomy 13 occurs in about 1 out of every 10,000 newborns. Most cases are not passed down through families (inherited). Instead, the events that lead to trisomy 13 occur in either the sperm or the egg that forms the fetus.
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Apparently, the only form of Trisomy that has an inheritance risk is the one that is rarest, translocation. So you need to find out from the baby's father which kind of Trisomy 13 he has. If it is not translocation, then it actually sounds like there is very little risk of inheriting it. It is still possible that the doctor will recommend an amniocintesis; talk it over carefully with a genetic advisor if so, with full information about the father's form of Trisomy 13.
Regarding whether he was a "test tube" baby (I assume you mean he was conceived via IVF), that will not have anything to do with whether he has Trisomy 13, at least I have never seen any research linking the two.