Why are my contacts doing this?

I’ve had my contacts for about three days now. Yesterday, when I put them in, they stung a lot for a minute and then they were fine. Today, however, I put them in and they stung, and it felt like there was something kind of sharp stuck in my eye. It got to the point where I had to take them out because it hurt so much. What could be the cause of this, is it normal for contacts?