Hi don't worry there are plenty of dates that open up at once. Usually every 2 weeks later. Once the slots are open you find dates that are avaliable for scheduling within 4 to 8 weeks usually. Keep checking no more than 3 times a day, since u might get locked out for 72 hours, if you check more than that per day. Also you can join the group on Facebook: K1 Fiance Visa Pakistan. It has all the tips that you would need for interview, dates when avaliable and how to go prepared. Good luck.