Im really in need of some good advice so any help would be appreciated!!

Basically ive been on the pill for ages now and over the last few months by periods havent been on time so recently i decided to come of my pill and have been now off the pill for about 2 months because i thought it may help to get my periods on back on track. However now at the moment i am nearly a whole month late. Ive taken 3 pregnancy tests and they have all come back negative. Ive been with my boyfriend for nearly a year and were both equally as worried about whether im pregnant or not. Im really scared and worried about what to do!! Please help me try and sort this problem out!