Just a little worried

Kali • Kali

So today I had a obgyn appointment and they said I’m measuring almost 2 weeks behind and I keep losing weight for the last several appointments. I was small to begin with and now that I’m 32 almost 33 weeks pregnant I should be gaining. Ultrasound last week they said she was measuring about 4 lbs but I know that’s a guestimate. I’m having a hard time peeing if at all when I do go potty it’s very little. In the middle of the night I will wake up to cramping and nauseous. I had to start my first nst (non stress test)