Is this labor!?!

Lindsay
I slept pretty good last night but felt crampy as soon as I got up. This continued as I got ready for work.. Once I got here I've started timing them as they seem to be coming and going pretty regularly. It is definitely painful but not unbearable.  I was supposed to have an April baby (4/27) but he's taking his time. The pain is in my lower back and under my belly. Belly also appears to be hardening up. My husband is in his last week of clinicals for nursing so I don't want to call and interrupt him unless this could be the real thing!