Thoughts? Stories to share?

I’ve had 2 miscarriages, one in 2016 and another in December. The drs did a discovery, and found out that there was a chromosomal deficiency and the next time I became pregnant that I would “just be pregnant”

Yesterday I woke up with some nasty one sided back pain. When I bent my neck my back aches and I’m having spasms. My dr is certain it is not pregnancy related but wanted to check my beta and progesterone. My beta came back at 15. My LMP was March 13th. I got a positive opk on the 24-25th am and it went lighter on the 25th pm. He’s asked that I come back next week and test again. Should I be worried? I’m not having any bleeding or bad cramping and this morning I woke up with more symptoms than I had before, and last time moment I got a positive test I KNEW something wasn’t right. This time I’ve felt pretty great.