What Causes Whitish Orange Vaginal Discharge?

Hello Doctor, i was on siphene on my 2nd day of period for 5 days and i took follicular study on 12th day and on 15th day i got 2 eggs ruptured and i had intercourse..now my period is due on 4th july..can i be pregnant? can i check pregnancy with home pregnancy strip now. i am on progestrone Susten 100 mg daily. Today, i got a whitish-orange discharge once..pls make me clear. i dont have any pregnancy signs.. shall i check for pregnancy today? is there any possibility?