Did i overdose on ativan?

I'm some what ashamed of this but, like a couple months ago my mom was prescribed lorazepam(atvian) and I found it and decided to take one, I remember not feeling it and getting a couple more, after that I remember basically NOTHING. I remember my mom finding out and yelling at me through the bedroom door, then I blacked out again. Then I remember leaving my room and throwing up twice, and it looked like solid white paste. Next thing I know two days had passed since I first tried them. I didn't go to school,and I dont remember eating at all. I found out I ended up taking 20 and a half pills. I remember 3. Do you think I od'ed. It's scary to think about this.