How do I know if I'm having a contraction?

Bárbara • I'm 24, and I have a beautiful baby girl born on May 30th, 2017 ^^ I also have a dog named Oliver and I love him lots!

So I woke up today and I was feeling a little pain on my lower abdomen but I drank orange juice and it went away, how can I know if that was a contraction?

My Dr. told me to go to the hospital if I felt any contractions this weekend, I honestly don't even know how they feel, this is my first child btw. Can someone tell me? Thanks! ^^