I'm in so much pain

I had my midwife appointment today and I've just her to get some advice but...
I am in so much pain! I've been experiencing a bruised like feeling on my vagina, where you'd imagine a panty liner to be sat. It feels like I've been on an uncomfortable bike seat all day or horse riding. I've been getting these pains on and off for a week or so, but today, they are excruciating. I was hoovering earlier and actually stopped in my tracks from the pain! 
Can anyone give me an insight as to what this is, why I'm having this or even give me any advice on pain relief. Like I said, I've texted my midwife but I'd love to hear from you guys.
I'm 37+4, my baby is engaged and I lost my mucus plug last week x