New Here

I had a Pond put in last fall, so no grass was planted last year.
Late last month (April) did some final grade work with a bobcat and Harley Rake. Bad thing happened and Harley rake broke, so was forced to finish with a Harrow on the back of a tractor to break up rest of dirt. Oh by the way soil is very clay like. So after all the dirt work i broadcasted all the seed out with a first step fertilizer, then drove back over the seed with the harrow to sew the seed in the dirt. Now i am no expert on this at all just a FYI.

So now three weeks later only small amount of grass are coming up, now i am at a point i don't know what to do after putting down 550 lbs of seed?? any suggestions

Thanks