It wil;l help to know your location, 'here' we are deep into freezing mode so grass wouldn't a come up 4 weeks ago, and spray won't work if you are going into a long freeze period.
Igf I assume you are in a warmer area then there are different options.
In general if the weeds will freeze off before they go to seed you don't have to worry about them.
A broadleaf as I think you are describing is pretty easy to kill in fall with a cheap 2,4-D or some such, but will also kill any clover or alfalfa if you have those seeded. You don't want to spray too soon after the grasses come up, can be a little hard on them when they are very young - so again, depends on where you are, for what stage you are in.