Congratulations on your pregnancy!!
It sounds like we are in a similar boat (but different colored sails:) I think you're right!
I did so much preparation even before conception to try to conceive a boy, but just had an ultrasound this week which revealed 80-90% girl. All of the chinese calendars, (lunar, etc.) and prediction websites said boy, as well as an at-home "pee" test that I ordered online. I wouldn't trust those calendars as far as I can throw them, which in my current 22 week condition, wouldn't be very far. They are fun to look up, but you have to take them with a grain of salt.
Good luck and best wishes!