Congratulations on your pregnancy. I am a mother to 2 kids and coincidentally, am also a Pharmacy technician and I agree with your friend, I will personally not take Darvocet during a pregnancy.
I searched drug.com for you just give you something on paper, this is an excerpt and you can look it up at: http://www.drugs.com/cdi/darvocet-n-100.html
it reads "PREGNANCY and BREAST-FEEDING: Darvocet-N 100 may cause harm to the fetus. If you think you may be pregnant, contact your doctor. You will need to discuss the benefits and risks of using Darvocet-N 100 while you are pregnant. Darvocet-N 100 is found in breast milk. If you are or will be breast-feeding while you use Darvocet-N 100 , check with your doctor. Discuss any possible risks to your baby."