There are no rules as to when you can see her and when you cannot.
If you want to see her on weekends then GO and see her on weekends. If you want to see her only during the work days then see her only on work days.
When you see her doesn't define what type of relationship you have with her. I had a FB who I see everyday for two months. I had a GF who I only see once a week.
If you don't want her as a LTR, then TELL her. If you want her as a LTR then say nothing and just do LTR things.
If you fret over when to call her, when not to etc AFTER you have slept with her, it screams insecurity and she will sense it and you will be dumped.
Whatever you do, do it with AUTHORITY and that nothing you are doing is wrong.