Ended a pregnancy at 13weeks due to trisomy 21. is this likely to happen again? i'm 34.

YOUR OB: Should have gone over all of that with you , am surprised you are asking that ? Here, it is most likely a spontaneous mutation, but you can go for genetic counseling to see if you need a chromosome analysis.

Depends on variables: If your fetus was a classical trisomy 21, your risk would be roughly 1% plus your age related risk (1/270). If it were a translocation ds (6%) the recurrence risk could be as high as 100%.Any pregnancy has a basic risk of unexpected outcome in at least 4%, so with your prior experience a visit with a geneticist to explore both family trees to assess your possible outcomes.

Ask for testing: You can ask for genetic testing to see if you or your husband are carriers of any genetic abnormalities.