Should I Be Worried?

I'm almost 18 weeks and I've been having contractions all day randomly.. I've had these contractions like this randomly the last few days. I went to a concert last night and didn't think it would affect the baby since I'm not far enough for her ears to be developed far enough. This is my second pregnancy and I don't remember Braxton hicks contractions like this.. I felt her kick a bunch last night and a couple times today. No bleeding or other symptoms. Should I be worried?