Am i in labour?

I Went to the midwife today and she told me the baby is engaged. about 2 hours ago i got bad back ache and didnt feel to well i feel abit better now but iv still got backache and i have just had my first contraction at 10.30 it was painfull and lasted about 1 minute and my belly went rock hard then i had another one at 10.50 then one at 11.10 amd onther one at 11.25 witch lasted 110 secondsim 39 weeks pregnant do you think im in labour?