I'm 43. What are the pregnancy risks?

Variable. A thorough assessment of anyone's risks for pregnancy includes age, pre-pregnancy health & medications, and an assessment of the genetic input from both parents. A 43 yo has ~1/30 risk of a trisomy 21 down syndrome birth, added to a general 4% risk with any pregnancy for an unexpected event (cleft, premi, illness). A consultation with a genetic counselor could define your specific risks.