I had intercourse last Friday which is also my first day of regular menstruation. I got my period in the morning upon waking up. The intercourse was around in the afternoon. No ejaculation happened inside me, at least that I know of. At night, I decided to take nordette 21 (4 pills) and another 4 pills after 12 hours. On the following day, I got a bit paranoid and decided to take another 4 pills and another 4 after 12 hours and the following day, I still took the last pill. My period still went through for about 3 days and suddenly stopped. I was thinking it was the effect of the birth control. Is there a chance I could have conceived?

WHAT did you think you were doing? Nordette is not an abortion pill, nor does taking a lot prevent conception better. You took all 21 pills in less than 3 days?
You just overloaded your body on hormones, and side effects vary. Symptoms might be nausea, vomiting, and vaginal bleeding. Call your doctor about what to do for the rest of the month, and never do this again.
I doubt you got pregnant, but there is never 100% certainty.

I would even say that with that heavy dosage, you may want to go see your doctor, as the side effects of that much, can be harmful to your body.

1. I did not see the word condom ?
2. I did not hear the words I have been on normal birth control pills for over a month

If you had sex without using protection of course you can be pregnant, no form is 100 percent effective.

If you are this scared of being pregnant, stop having sex

Yes, your period is likely to be off cycle and mesed up for one to two months because of this