Back labor or did I pull something?😅

So I have tons and tons of pressure “down there” so it literally hurts to walk but for the past couple of hours I have had this really bad back pain. It’s in my lower back and mainly on my right side and it’s also accompanied with some period like cramps in my tummy. But it feels like a knife is going through my back and no matter what I do nothing eases it. It went away for about 40 minutes and then it came back. And now Its coming in waves. It’ll ease up for about a minute and then come back. But it’s only on my right side? so I’m really worried. I’m only 33 weeks. What do you guys think?