I have a 3.5 acre fescue lawn (the reason I mention the size is because it would be pretty costly to start over), still getting it started, it is a mix of some premium fescue/landscaper mix from tractor supply or atwoods, k31 and some fescue called hounddog. I sprayed roundup before seeding. Anyways, I didn't seem to have many weeds after the roundup, and the seed came up fairly well. I've used preemergent this year on the beginning of the spring and plan to overseed again in the fall. But now all of the sudden I'm getting this grassy weed all over the place, some places worse than others. What is it? and can I kill it with some chemical that won't harm the fescue? I have a few other weeds but they are all broadleaf and those weed & feed sprays have worked pretty well but this weed is not broadleef :(

Any suggestions?

Thanks.