Lots of braxton hicks at 21 weeks

Has anyone else had lots of Braxton Hicks contractions early in their pregnancy? I forgot to mention it to my doctor last time I was there. Today seems to be more than normal, but I get at least a few every hour, sometimes more. This is my second pregnancy and baby is doing fine, just curious if anyone else experiences this many. I got quite a few with my first, but I only remember them when I was further along