Sooo..I am almost 3 weeks late with my period. I have taken 4 pg tests, the lastest one this morning and they all show up negative, so I think I can rule out being pg. I was wondering what else could cause a late/missed period? I was 2 weeks late last month and attributed that to the prednisone I was on for 2 weeks the month before since my doc said it could cause me not to ovulate or ovulate late. But this month, I'm not sure what is going on. Could it be still from the prednisone knocking my cycle off track and its just not back to where it needs to be yet? Of course I'm kind of freaking out bc my periods have been pretty regular the 4 months before that when I started tracking them. And we want to TTC in May, so I'm starting to worry about not being able to have a baby... I went to my gyno about 2 months ago and everything was fine.