New alfalfa seeding

I have 50 acres of new fall alfalfa seeding. 25 rr and 25 of convention with OG. Seeding is 3 weeks old. Coming up strong. Ground was tilled prior to planting. Previously they were oats fields so have volunteer oats growing and some weeds. New to weed management practices. Any recommendations? To early to spray? What to spray? Thanks guys!!

New alfalfa seeding