I m pregnant. i was on diane35. missed it in dec for a day. mid jan i got the blood test done which gave a positive pregnant result. can this affect baby?

Unlikely: Diane 35 is a drug used for severe acne and has been used to prevent pregnancy. It can cause blood clots with severe consequences. It is unlikely to cause an effect in your baby if you discontinued its use with the positive pregnancy blood test. Inform your obstetrician. If you don't have an obstetrician, obtain one for the benefit of the baby and yourself.