I am NOT an advocate of lying however, IF you needed, could you say you have to do other things, such as run a specific errand that you can actually do within that time limit and get away with the visits being unknown. OR if you have to , you could say you have OTHER appt.s such as dental or annual. dont blame you for laying low for many reasons, I always kept quiet until I cleared the "first trimester" for safety. Not to mention the preasure parents may have on you would also be another reason to stay quiet for now. Good Luck and congratulations!!!