Snapped main stem

I've been there before, but I usually do it when still in veg when trying to tie things down or move things out of the way. Always a bummer. How much growth was on the main? Was it topped with several other branches coming off it or just a single top? Since you're in the flowering stretch for another week, you might see some additional veg growth take over that space, but you will definitely have a lower yield than you would have otherwise. It won't affect overall growth, you'll just be down whatever that branch would have yielded. I hope this helps!