I have a 401K but I didn't receive a 1099R

As long as you did not withdraw or rollover any 401k money, you do not need to report your 401k (and thus would not get a 1099-R).

If you did withdraw, the 1099-Rs are often available on the 401k administrator's website under "tax documents."

not 1099r just 1099  

what is the difference from 1099  or  1099r

There are like 20 kinds of 1099.
1099R, 1099Misc, 1099G, 1099Int, 1099Div, etc.

ok did not get form  1099r will it hurt my return

Do you need one?  Did you take a withdrawal or do a rollover or conversion?  I’m still waiting for mine to come.  Wait a week and see or ask the plan for another copy.