Spring plant should have taken. The biggest trouble I have had is PH. Never plant below Hay Below 6.2 and always use lime and pelletized lime aiming for 6.5 or better. Best for me is at least 300/pounds/arce of 9-23-30 mix with 50-100/lbs. / P-lime for most alfalfa mixes.
Seed should have come up about 3-7 days after rain and you should have cut any tall weeds as soon as they start to get flowers.
I try to plant is the fall too dry this year and I"m going to have to plant this spring.
Western PA here !!