Probablly a good chance they are,I went for a scan at 17 weeks and while I was there was having BH contractions, I could'nt feel them but the US person pointed out what was happening on the scan, as I got further into the pregnancy I had lots, no pain just lots of tightenings all over the place. Or maybe baby moving but sounds to consistent and regular. Have fun in the 2nd half of your pregnancy.