Congratulations on your pregnancy!
There is no reason to avoid intercourse during pregnancy and throughout the full course unless you develop complications such as a full placenta previa (where the placenta covers the cervix and you may experience bleeding) or if your water were to break or other complications that would require pelvic rest. This would only be if your doctor found a problem and needed to restrict such activity. In most women, intercourse is enjoyed throughout, right up to the time of labor.
Travel is also fine, even by air, unless you have complications such as threatened preterm labor. Usually the doctors recommend you avoid travel in the last month, if it is a long flight. But, in pressurized modern jets, travel by plane is approved. If you take a long flight it's good to get up and move around at times since you may be more prone to develop blood clots when pregnant and staying in one sitting position can put you at greater risk for blood to pool that way.
Best wishes for a healthy pregnancy.
The answers in online forums are for information only and are not intended to substitute for medical advice and care. Please see your personal health care provider for further evaluation of your individual case.
Debbie Miller, RN