Could you explain a little more about the pain location and sensation? To me "bra strap" means my shoulder or even shoulder blade. If it's a raw sensation, have a buddy check your skin for signs of irritation: bra straps can really rub the wrong way sometimes. A deeper ache could be a strained muscle or a bruise.

For me, bleeding, bloating and pain in the ovary area indicate a cyst. But also, just because you're not regularly active doesn't exclude musculo-skeletal pain. Inactive bodies are even more prone to injury from stupid stuff like standing up wrong or sleeping funny: the body is less flexible and the muscles less resilient.