Kev, my Meyer's has thorns..The lable ID'd as Improved Meyer's so I'm assuming it is..Thorns are about 1" long, but don't cover the entire tree/s. (I've more than one Meyers)
Is your tree grafted? What's it's age/height?
Now that days are getting longer, (thank goodness) citrus should flower..the thing about Meyer's, seems they're always in bloom and/or fruit. Make sure your tree is getting enough sun/additional artificial light..Some humidity and fresh, circulating air..Cooler nights help, too. In summer, (if possible) set outside..Fertilize..Toni

I bought a variegated improved Meyer Lemon at least 4 yrs. ago at Lowe's and it has never had thorns,; it's blooms are heavily scented (and heavenly scented!) and although I only have it in a 10 gallon pot it provides about 10-12 fruits every year. I am in zone 8B in Texas and protect it in the winter. Some people say that they have planted it in the soil in zone 8 B but I just don't trust that.

Thanks for the replies

Im not sure if its grafted or not,does grafted mean a clone?
Its almost 3 feet tall,dont know how old but you can tell it was pruned before it got to the store.
I live in Charleston SC so I have been able to leave it outside on my deck to get about 8 hours of sun a day.