Middle back pain about 9 dpo?

I started having VERY bad middle back pain today. I’ve been trying to sit in different positions, stretch out, even pop my back and nothing is working. I’ve also been kind of crampy all day and it’s into lower back. I tested like 4 days ago or so and was negative. Also last night, I had a big amount of creamy cm and i’ve never had that much in one glob before... Should I test again soon? I have pcos so my cycles can be very short - very long.