After you get off birth control is one of the most fertile times...
A lot of people dont know, but some dr's use the pill in fertility treatments.
They will have the woman take the pill for a certain amount of time, and then go off of it to get her fertile.
It's pretty simple... Birth control fools your body into thinking that it's pregnant. Thats why some women experience pregnancy-like symptoms (swollen feet, nausea, cravings) when they are on birth control. That may be what it is..
The best thing to do is act as if you are pregnant (good idea!), and just wait another week!! ;]
good luck <3