Hello and thankyou for approaching DoctorSpring with your query.
I have gone through your case and understand you concern.
It is right that it is common to have CMV antibodies as you may have got it sometime earlier. It is less likely that you had a primary infection or reactivation at the time of your pregnancy. Even if you had a primary infection, antiviral drug treatment is rarely indicated in immunocompetent adults, including pregnant women. So most likely you had a CMV infection at some point of your life and it just manifested as a positive test. ( CMV test can be positive from past infection also)

Treatment of asymptomatic cytomegalovirus (CMV) infections that are congenital or acquired in a normal host is not recommended.

It is very unlikely that your child has developed a congenital infection. However you can get the child tested in the first 3 weeks after birth from urine or saliva sample. Discuss with your Pediatrician whether the test is really needed. If your baby is healthy and asymptomatic there is nothing much to worry.

I would suggest that you need not worry as it is unlikely to cause any problem as you are NOT immunocompromised.
If you have notice that your child has decreased hearing, jaundice, rash, feeding difficulties, seizures or any neurologic problem, you can get the child examined.

It is not recommended to get tested before your next pregnancy as you already have antibodies to CMV, besides it is difficult to distinguis whether it is primary or non primary infection and no vaccine is available. Antiviral therapy is not recommended if you are immunocompetent and have no symptoms.

I hope this has helped.
Feel free to follow up.
Thankyou