Hi, I had gone through your question and understand your concerns. I dont think this can be related to gallbladder surgery since this has nothing to do with vaginal bleeding. It is more likely pure gynaecologic issue. When bleeding occurs between normal periods, there are many possible causes and most common is a hormone imbalance While some causes may be easy to treat, others can indicate a serious underlying condition. Whether you notice spotting or heavier bleeding in between periods, it’s important to see your doctor for testing, diagnosis, and treatment options. Potential other causes of bleeding between periods include a growth in the uterus or cervix, stress change in medicatios or miscarriage or vaginal dryness. Diagnostic tests can help your doctor find the cause of the bleeding. Your doctor may draw blood to check hormone levels. Then right treatment can be recommened. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health.