Hi! After 5 years, my doctor took me off of birth control for 3 months due to spotting in between periods. I had my cycle on June 20th. I had another cycle which was very light on July the 17th. My next cycle was due August 14th, but I am late. I am only two days late, but I decided to take a HPT anyway. It came out negative. Why did this happen, and should I be worried? I did have sex during this time period, but it was always protected. I had unprotected sex one time, but I used a Plan B the next day. Advice please? Thank you!