Bad lower back pain and constant, dull cramping?

Hi ladies! I should be about four weeks along today - I’ve been getting BFPs since 12/1 - and I’ve had dull cramping for the last couple of days, but today it feels like so much more. It’s a deep cramp, constant and dull but prominent enough that I can’t really ignore it. It’s paired with really bad lower back pain. I don’t remember the first few weeks of my pregnancy with my son; I don’t have insurance until the 1st of January so I can’t just go to the ER or call a doctor.

It kind of pinches on the left side of my lower back.

Has anyone had an ectopic? Or experienced intense ligament stretching in their second pregnancy?