From the information I've gathered on the forums, birth control sways pink. You definitely need to give your body time to adjust. You track your cycle now and continue so you can see patterns clearly when you begin to make attempts. Hormones need healthy fats and minerals to work properly and balance themselves out, so I would start on a lighter version of the HE diet, without excess calories and then kick it up to full gear a few weeks before your attempt.
As far as bbt, your temperature has to be taken before you get up to do anything, even to pee. You need to have slept at least 3 consecutive hours before you take your temperature because yes, your chart results will be skewed. Basal body temperature is the temperature your body is at rest and any movement, digestion etc will change your temperature.
HTH!