I am also 28 weeksand I have that too but I went to the ER and they have me shots to stop the contractions I am 1cm dialated and feel like baby is going to fall out :( I have a lot. Of pressure in my v!&!Π@ so my doctor is keeping a close eye because. Of my past history of preterm labor!! Hope this. Is not your case but I would get check out!! To be safe!!
Actually, all through pregnancy, women have contractions randomly, but they don't begin to feel them until the baby gets bigger. Google Braxton-Hicks contractions for some useful information.
I'm going to bump this up because I've been feeling the same for a bit now and curious what the ladies have to say.