Hi. I had my tubes tied almost 3 years ago, I'm currently 28. They were tied a month after my c section. I normally have extremely heavy periods. For about a month now I've had a bad gag reflex and have been more tired than usual. 7 days ago I started lightly bleeding mostly dark blood (only when I wipe) not enough to fill a tampon during a days time. I'm wondering what this could be. I've taken a pregnancy test that was negative. Also I had a good bit of pressure in my lower abdomen which lasted about 2 days with lower back pain on and off.