could I be pregnant?

I have a attached a photo to explain this...
On march the 20th i had unprotected sex and he finished inside me by accident (this is the big green coloured in circle) my ovulation period was then 25th of march - 30th march and I think I ovulated on the 29th if that's what it means? Anyway, my period was due on the 7th April (I think- it's now moved to tomorrow's date because it still hasn't arrived so it adjusts) anyway it's the 11th and I haven't started yet, should I be worried? After the ovulation period I was having a lot of creamy thick white discharge too. Please help I'm not sure if I should be panicking