jojoj,
Welcome. Yes what you are describing is very typical of BFS. I had weak sensations in my legs sometimes the right then the left sometimes both and I also had twitching constantly in my arches and my calves. You do not have ALS you have BFS. Have you made an appointment with a doctor to get yourself checked? You should strictly for peace of mind.
But as far as your question, yes that is BFS. Read some of the backposts and BFS in a Nutshell and you will find alot of comfort there.
Best,
Kit