help advice and help please

Kayleigh
So for the last 2/3 days I have noticed that I have this thick Jelly like discharge which I've never had this before and it looks like the mucus plug in late pregnancy.
I've taken a few pregnancy tests and they have all come back negative but I'm unsure if I'm testing to early. Can anyone please help its driving me mad. Also I've had really bad backache and for the last week I have also noticed that inside my vagina it feels like something is pushing down there but it doesn't hurt just feel odd. Can't think of any other way to describe it.