Is this normal..?

I’m currently 20+2 with my first baby & a few days ago I went to my doctors because I was having bad cramping on one specific side. My doctor told me it had been round ligament stretching & that everything was fine. Today, for about the past two hours, I’ve been having cramping again but this time it’s in the middle lower abdomen. Is this also round ligament stretching? Since it’s been pretty continuous for two hours (sometimes it doesn’t hurt as much but it still is there) I was a bit worried since it hasn’t stopped. I got the baby’s heartbeat on the doppler & I feel her moving. The pain eases up when I lay on my left side. Is everything okay?