Help!?

So for about a week now I constantly need a wee and feel like I’m not finishing my wee, which I thought was due to my period coming up as I get a really weak bladder then.

But each time I’ve tried to have sex it’s sore, not a I need a wee, but a strong stinging inside my actual vagina. What could this be, I’m working all day everyday next week so can’t ring the doctors, any at home advice?