If you had sex the day after the last day of your period, the chances for becoming pregnant are valid only if your cycle is 21 days in length. A menstrual cycle of 21 days is still considered in the normal, healthy range for menstrual cycles. A pregnancy test result is valid only if the test is taken not more than 5 days before an expected period comes. A pregnancy test is most useful when taken after missing the expected period. In your case, you didn’t tell me when you’ve done the pregnancy test so I can’t tell you if the result from the test is relevant or not.


You can get pregnant if you have unprotected sex during the fertile days of your cycle. The fertile days of the menstrual cycles are the 2 days before and the 2 days after ovulation. Ovulation occurs about 14 days before the next period comes.


Tegratol (carbamazepine) increases the risk of congenital malformations but for pregnant women with epilepsy, there is another problem. Epilepsy itself is a risk factor for the development of congenital malformations in the fetus, no matter if you take anticonvulsants or not.