As a mom who was High Risk. I had 3 losses as well. I would NOT travel at all. I missed my sister's college graduation and many events but my doctor would not approve any travel. I ended up having to be hospitalized with my last 2 daughters b/c of pre-term labor.
I know that these are two very special and important events but I believe that your health and your child's health are most important and you should stay at home close to your doctor and if necessary your hospital. Not to scare you but if the Dr doesn't want you working you shouldn't be traveling