Alah, don't worry too much lah, nosebleeds during pregnancy are quite common because hormones increase blood flow to the mucous membranes, and your nose area becomes more sensitive and swollen. Since you don't have headaches or dizziness, that's a good sign, but it's best to mention this to your doctor at your next checkup just to be sure everything is okay, especially since it's happening quite often. In the meantime, try to avoid blowing your nose too hard, keep the air humid, and maybe use a saline nasal spray if it helps, take care of yourself, ya!