Cramping. 4w 3d

Liz • Pregnant after 3 years of trying after a miscarriage at 12 weeks. Very scared this time around. Hoping for a healthy pregnancy.
I'm concerned about the cramping I've been experiencing. I only notice it when I'm sitting or laying down. But, if I'm standing it's faint. I've also been experiencing pain in my lower back. I called the Dr and have an appointment but, because I'm not far along they won't see me. Has anyone experienced this before?