Tweak please?

Hello, so I'm due on today and I have felt for a while I could be getting my BFP this month but over the past week I decided I wasn't. So today came and no sign of AF. I'm not feeling great today and my lower back has started getting really sore, started last night. I've just taken a pt expecting it to be negative but I wonder if there's actually a VVVVVVFL? Would anyone mind tweaking please?