Hello, Thanks for sharing your health concern with us. I have gone through the query and here are your answers. 1. Hymen can be torn even with slow movement and with partial penetration. Pain/burning sensation/bleeding/spotting are observed. 2. As you have irregular periods, an impending period also is possible. 3. Once the hymen is torn, scarring occurs and after healing, further intercourse does not cause bleeding. 4. During a clinical evaluation, the examining doctor can detect a torn hymen. Hope you find this information useful. Take care.