Is pregnancy possible in human males?

Yes it is, but at the risk of the man's life.

The human male does not have the anatomy that is required or natural embryonic and fetal development.

It is theoretically plausible for a male to have an ectopic pregnancy (pregnancy outside the uterine cavity) but has never been tried, and it could never be justified, even for women that have no uterus.  The risk to both the parent and child is extreme.

Robert Winston, a pioneer of in-vitro fertilization, told London's Sunday Times that "male pregnancy would certainly be possible.

The embryo would be implanted into the man's abdomen cavity.  The placenta would attach itself to an internal organ, like the bowel, and delivery would have been done by Caesarean section. However the abdomen is not designed to separate from the placenta during delivering.  At a very high risk.

Women are known to have ectopic pregnancy, when the pregnancy is discovered, they perform an abortion.

The risk is so great.  Though there have been women that have delivered ectopic pregnancy.

Since 2000 there have been hoaxes saying that men have delivered babies.  In fact there have been no experiments to see that it would be viable, as the risks are too great.

There are other ways that a man can become pregnant.

Uterus Transplantation

Having a uterus transplanted into a male body would provide the protection necessary for both father and fetus.  Transplanting a uterus into a male would not be even more difficult or different than transplanting one into a female.  The uterus can either be donated by a willing donor or engineered by using the male's stem cells and then implanted into the pelvic region.  The standard in vitro fertilisation (IVF) would be used and the fetus into the male's newly formed or donated womb.

Transgender males

Some female-to-male transgender men can become pregnant. This is possible for transgender men who still have functioning ovaries and a uterus.

What is a transgender female to male?

Sex reassignment surgery from female to male includes a variety of surgical procedures for transgender men that alter female anatomical traits to provide physical traits more appropriate to the trans man's male identity and functioning.

Fetus in fe

This is not an actual pregnancy but an extremely rare condition when a mass of tissue that resembles a fetus forms inside the body.  The abnormal development in which a fertilized egg splits as if to form identical twins, but one half becomes enveloped by the other, and an entire living organ system, torso and limbs can develop inside the host.  The abnormality occurs 1 in every 500,000 live in humans.

In an extremely unusual case, a 2-year-old boy became pregnant with his parasitic twin inside his stomach feeding off him like a normal fetus would feed on its mother. The boy required a Caesarean section. It is virtually impossible that the fetus could survive this process due to being underdeveloped

Comedies 

The concept of male pregnancy has been the subject of popular films.

The 1994 science fiction comedy/drama Junior stars Arnold Schwarzenegger as a fertility researcher who experiments on himself

The 1978 comedy film Rabbit Test stars Billy Crystal as a young man who inexplicably becomes pregnant instead of his female sex partner

1990 BBC television comedy drama Frankenstein's Baby features a Dr. Eva Frankenstein helping a male patient to become the world's first pregnant man