Thanks for the query.
If you used the contraceptive
pills as per the guidelines, there is less possibility for pregnancy
For more details : http://srsree.blogspot.com/2013/11/general-guidelines-of-using-combined . html
If you missed pill, there is less possibility for pregnancy.
In that case the symptoms could be due to pregnancy.
If not the symptoms you are having could be due to side effects of the contraceptive pills.
Urine pregnancy test kit sometimes may not detect early pregnancy.
So, once go for blood test
If the test comes negative, the possibility of pregnancy is less.
Then, you can take symptomatic treatment and can continue with your pills.