Real labor at 20 weeks?!

Feeling a bit worried.
I'm nearly 20 weeks and today I've been feeling strong Braxton hicks, about every 5-10 minutes. 
I don't remember ever getting BHC until late pregnancy with my two other pregnancies and even then they never hurt. 
If these were infact real contractions they would be dilating my cervix right? Is there a way I can check to see if my cervix is dilating myself before hauling my two kids to the emergency with me!