What Are The Chances Of Pregnancy Having Missed Contraceptive Pills?

Hi Doctor

Please help me.
I am 28 years old and was on the pill where i forgot to take 3 pills while me and hubby been together.
I had another 5 pills which I took as normal.
Now I was supposed to get my period 13 days ago,had anegativ urine test and did blood test this morning and came back negative.
What is wrong with me,my breast are sore around the nipple and have had bad cramping for this last 14 days.
Can I still be pregnant or Im messed up coz o the pill.
Ps:didnt start a new pack waiting for mr period but really hope Im pregnant still
Thank you