The symptoms you are having could be withdrawal effects of the pills, as you missed 4 pills.
But if you had intercourse on the days when you missed the pills and after that, there is possibility of pregnancy
Now you use some additional contraceptive
measure till the completion of this pack.
Then if you do not get withdrawal bleeding within one week of stopping the pills, go for pregnancy test.
If the test comes positive, consult gynecologist get examined and go for ultrasound
Depending on the gestational age
, you can proceed further.
For more details you can ask me directly through the premium forum.