The hormones that are in birth control pills can throw your period off track. After ceasing to take the pill, it could take 3-6 months for you to get pregnant. It looks like you are still in that window. That is the disadvantage to hormonal birth control, there is a bit of a wait period after you get off of it until you become pregnant.
It looks like you may have to wait this one out. I know you said that you have been experiencing symptoms, but unfortunately pregnancy symptoms can be the symptoms of other things as well. You also have to take into consideration that it can take healthy couples up to a year to conceive.
If your period does not regulate itself 6 months post stopping the birth control, you may want to see a doctor for options to regulate your period.
