HI K.,
It does sound like a contraction, but don't get worried yet. I have a 3 year old and a 1 year old and both of my pregnancy I had contractions for a few weeks before the BIG day. Actually with my first child, I was 4 centimeters dialated & would have random contractions for 4 weeks before he was born. I had a LOT of pressure during that month.
Then with my second child, she would kick my psychiatic nerve in my back frequently. This would send shooting pains down my butt and the backs of my legs.
I kept a journal of the frequency of the contractions or pains and then would keep my doctor updated. In the end, my son came on his due date with my water breaking during the middle of the night. My daughter was born only a few days before her due date and that was because I was induced.
Good luck.
P.S. My contractions were different than most experience I guess. Mine never got closer together in frequency, but they would last for a long time. It was if instead of having the pains come and go on a regular basis. It would feel like someone would put a belt around my belly and just squeeze it has hard as they could for 5-8 minutes and then it would stop for 15-20 minutes and then start again. The contractions never became 3-5 minutes apart which I have heard from other people. This really threw the hospital staff and my doctor for a loop when I went into labor with my son. My water broke at 5 am. I went to the hospital at 11 am. The hospital wanted to send me home because they said my contractions were not close enough to be in active labor. I told them my water broke and they said I was wrong that I must have peed the bed because it wasn't leaking now. I told them that it happened at 5 and now it was 11 so no kidding there wasn't any fluid left. They finally called my doctor in. She had the hospital run some sort of test on a fluid sob that they took from the area and it was confirmed that it was amniotic fluid and the mucus plug was deteriorating. I KNEW ALL OF THIS. I had soaked through 10 towels at my house before I went to the hospital. I just didn't want to sit in the hospital all day. I was much more comfortable in my own home and took a shower. Sorry I turned this into such a long answer. I just wanted to share my experience since it was a little different than most people have and you mentioned you were induced during your first pregnancy. Like I mentioned earlier keep an eye on them. Time the contractions and call the doctor with any questions. Hopefully they have a very friendly nursing staff who can walk you through anything.