Pregnant and husband on wellbutrin. can it be excreted in semen in quantities large enough to cause teratogenic harm if we have sex?

No: There would not be any significant amount that could reach the fetus. Medications you take by mouth or those injected into your body (shot/IV) would be the drugs I consider worth monitoring.

Wellbutrin effects: US FDA pregnancy category C: Animal reproduction studies have shown an adverse effect on the fetus; and there are no adequate and well-controlled studies in humans. Go with your husband to see Psychiatrist to discuss Medications for Depression, along with effects on fetus: • SSRI • Effexor • Remeron • Tricyclics • Wellbutrin have Marital Therapy to improve emotional, physical and sexual intimacy.

Unlikely: The amount of drug in semen and absorption of any amount through the vagina would be infinitesimal. For your peace of mind you may have your husband wear a condom during first three months of pregnancy. Wish you good health and a healthy baby!