Coming off the pill can cause all the symptoms you have. Other things can as well. Implantation occurs 7-14 days after fertilization (hence why they call it the two week wait to test) and until then you won't get symptoms.
pregnancy symptoms will not show before implantation, and implantation happen 3-10 days after ovulation. i don't really know when you have ovulated, maybe stopping the pill messed with your cycle. however, try to calm your self and test the day AF is due with FMU.
wish you all the best.