Usually, anything above 11 g/dL is considered a good normal range during pregnancy, as your blood volume increases to support the baby. If it drops below 10, doctors generally suggest iron supplements or dietary changes. Just get your blood count done regularly and let your gynac guide you on the exact numbers.
During my pregnancy, my hemoglobin level was around 11.5, and my doctor said it was perfectly fine for me. I am not an expert on the exact medical ranges, but I focused on eating spinach, beetroot, and pomegranate to keep it up. Your reports will show your range, so do discuss it on your next visit.
I think the normal range can vary slightly depending on the lab and which trimester you are in, so please check with your gynac. Low hemoglobin can make you feel very tired, so it is super important to get the doctor's proper advice. Don't try to self-diagnose from online charts.
With twins, my hemoglobin was always dropping because those two little monsters were absorbing everything! Mine was around 10.5 and my doctor had to put me on extra iron supplements to keep my energy up. Don't stress, just eat your green veggies and let your doctor handle the math.
My hemoglobin stayed around 11 through most of my pregnancy, and everything went well. Try not to worry too much about the exact numbers on your report. Just eat healthy home food, take your routine iron tablets, and take plenty of rest.