Absolutely you should do it!
There are no official rules to follow, aside from following the prompt. Also, there are two options for the weekend #freewrite. The first is to link three new prompts together into a full story, and the second is to use one of the older prompts that you may not have done at the time.
So even if you have an idea in your mind for weeks after you see the prompt, you can still post it on time!
Thanks for the nudge! I will. I’ve done several, including the set of three in the weekend, but haven’t in some time, partly due to Write Club commitments, and partly because I needed an m.o. like what you’re doing. I love it!