In my personal experience of having 2 kiddos, I flew with both of them (flight and surface) and I was extremely sick during the first trimester. I took Zofran around the clock. At the end of my second trimester, i started outgrowing my jumpsuit and had to get creative with my new look when I couldn't zip my suit up and going to to the bathroom often was a chore. Thankfully, my nausea/vomiting was relatively gone in the second trimester. But towards the end it was really uncomfortable to transport after 36 weeks. The jarring around and the unpredicitability of how long you were going to gone on transport and back was grueling on the stomach (hungry), or bladder. Cause it's not so convenient at times when you have a critically ill patient, and your having issues.
My friends that transport as well, were in the same boat as me. It is hard to say that you will be able to transport the whole time till your due date, that just depends on your MD recs and what your body is telling you.
Then you are gone for maternity leave, which will leave the team short again. And the big question debate is if you are planning to breastfeed or not? If no, then it will be easier for your transition back to work. If you plan to breastfeed ( I did), in my experience it was pretty tough. Some work days were great, they were light and you were able to do what you had to do. But somedays were hairy and you could only get away like 1 or two times. Often, I had to pump on way to a call (discretely). It can be done, but I remember I was always stressed and praying that the pager wouldn't go off while I was doing my thing.
In all fairness, if your young and recently married, I am sure your employer has thought about that, and you can't live your life around work and miss out on the things that are important to you.
But who knows, your priorities may take a turn and change for what your thought you wanted after you have a little one. I can tell you I love my job, but I could also give it up for what my family needs. That is a far cry from what I would have said prior to having kiddos.
Hope this helps.