Humira and side effect what to expect

If I start first Humira shot this Sunday 5/12 the second shot fall on May 26 which is the day we are flying to Europe. Shuld I plan this differently? Since we haven’t started yet I am worry about how she will feel after the shot, if the international long flight does not cause any issue. I do not know maybe I am to much paranoid, but want to be prepared for all scenarios. Has anyone experienced any side effect in the beginning? I am littel afraid of not giving her injection, but mostly…