Thanks for posting your query at DoctorSpring.com
No documented harm is seen from Dramamine to a developing fetus.
It is indeed safe to take it if it is imperative to do so, occasionally and for short bursts of time.
So you can go ahead.
A caveat also is to take no drug unless absolutely essential for you.
So see if you can manage, and if you cannot, take it for awhile.
Take regular folic acid supplements also.
All the best
Please feel free to discuss further.