Last night I had sex and was wondering if I could possibly be pregnant. I am on nuvaring but on nuvaring you leave it in for 3 weeks, and take it out the last week. But I just put it back in yesterday because it was the last day of my period. Then today I woke up and was bleeding which I found strange because it never lasts a day longer. I was wondering if I should be worried or am I just being paranoid.

If you had sex last night it would be too early for you to be pregnant. It takes 3-5 days for the sperm to travel to the fallopian tube where the egg is fertilized.

Also, assuming you had your period when you had the ring out, you have already, most likely ovulated and expelled the uterine contents including the unfertilized egg.

The bleeding could be what is called residual bleeding, meaning that the orgasm you experienced, if you indeed did orgasm, caused your uterus to contract expelling just a bit more of the blood from your uterus.