Mine fell to 9.2 in my last trimester and my doctor immediately started iron injections to raise it before delivery. It really helped me stay strong during labor. Please check with your doctor for the right course of action.
Honestly, my hemoglobin dropped quite low in my second trimester and I felt so tired all the time. My gynecologist changed my iron brand and told me to avoid tea/coffee with meals, which worked wonders for me.
Don't stress, just be regular with your prescribed iron tablets. I managed to keep my hemoglobin normal with a mix of leafy greens, apples, and the supplements my doctor gave, and had a very smooth normal delivery.
It's very common but please don't ignore it. Try to eat beetroots, pomegranates, and take your iron pills regularly as prescribed. Take care of yourself.
Eat simple iron-rich food like spinach, jaggery (gur), and dry fruits daily. And always take vitamin C (like lemon juice) with your iron supplements so it absorbs better. It's a very simple fix, don't worry.