I'm really tired of worrying about this is there any real possibility of a false negative hpt 4 months after possible conception? i have had all my periods on time for the past 3 months with the first one after being lighter after plan b . no sympt?

Pregnancy: You do understand that during your regular menstrual cycle your uterine lining of tissue and blood is shed and expelled from your body, preparing for another ovulation. No fertilization, and the cycle repeats, over and over. You've had plan B, three periods, no symptoms, and a neg test. It appears you are not pregnant, but you can take a blood test to settle all concerns.