My wife is recently pregnant. I take Minoxidil and finasteride every day. Is it harmful to her in any way?

Both minoxidil and finasteride are contraindicated for pregnant women.  However the current studies on these medications do not preclude them for being use in men when their partners are pregnant.  Finasteride, can be cecreted in semen and transfer to a pregnamt women during an intercourse but the amount of it is negligible.

Do men need to stop minoxidil or finasteride when fathering a child?This is an important question and I generally advise patients to review on a case by case basis with their physicians.

 Finasteride is found in semen at very, very low concentrations. If finasteride weren't found in semen, the issue would not even be an issue. But finasteride is found in semen at doses either undetectable to up to about 21 ng/mL. Studies have shown these concentrations do not appear to harm a developing baby. Many, many men have fathered healthy children while using finasteride. Women should not use finasteride not touch the pills if pregnant or trying to become pregnant. At the present time, there is no evidence whatsoever that the children (either sons or daughters) of men taking oral finasteride or topical minoxidil have a higher risk of birth defects.

However, finasteride may lower sperm counts and cause temporary infertility in some men. Couples having difficulty conceiving need to be aware of the possibility that the man's use of finasteride could be problematic.REFERENCES
Amory J, Wang C, Swerdloff R, Anawalt B, Matsumoto A, Bremner W, Walker S, Haberer L, Clark R. The effect of 5a-reductase inhibition with dutasteride and finasteride on semen parameters and serum hormones in healthy men. J Clin Endocrinol Metab. 2007;92:1659–1665.
Lewis RW, Lieber MM, Hellstrom WJ, et al. The effect of finasteride on semen production and sexual function in normal males. J Urol. 1992;147:398A.