Yes, of course it's perfectly safe... unless your pregnancy is classified as high risk.

The Nemours Foundation says sex may not be safe for pregnant women with any of the following risk factors:

* A history or risk of miscarriage.
* Having had a previous birth that was pre-term (earlier than 37 weeks), or having warning signs of pre-term labor.
* Vaginal bleeding, discharge or cramping that cannot be diagnosed.
* Leaking amniotic fluid.
* Conditions such as placenta previa and incompetent cervix.
* Carrying multiple fetuses.