I ovulated late this cycle (cd25-26). I'm 11 dpo and got + pregnancy test. Does late ovulation increase miscarriage or probs with baby's health?

Delayed ovulation. No, conceiving in a late ovulatory cycle does not increase your chance of miscarriage. It just confuses people on your actual date of conception and the due date. An early sonogram( first trimester) confirms helps determine the actual gestational age of the baby and usually results in an adjusted due date based on the sono findings and not your last menstrual period date. Congratulations!