Hmm. I had a knee surgery and they kinda....forgot to give me the normal preventative dose of blood thinner for that kind of surgery, AND they did NOT tell me to stop taking my birth control (yasmin) even though they knew I was on it (it was written on FOUR pages). Well, I didn't know to stop birth control, they didn't tell me, I got several clots in my right leg. 3 years later, my right ankle is not normal (blue-purple color and fatter than the left), even though the clots are gone. Damaged the vessels or whatever. I never took birth control pills again. We used condoms (TOTAL inconvenience!) until I was cleared with no clots. We threw out the condoms, got pregnant, and I had to take a shot of blood thinner (preventative dose) every single night of pregnancy and a few weeks after in my belly. Once our second was home safe and sound, my husband went and got a vasectomy 3 days later because we didn't want to take a chance on another pregnancy OR blood clot! What did it feel like? Hmm...I don't know if there was pain or not, since I was healing from knee surgery, felt like the whole darn leg hurt but not sure if that was from surgery or clots. I know that I got a little marble color of blue, gray, different colors like bruising where the blood was pooling. :( It was warm / hot. When the physical therapist said she couldn't touch me and I needed to go get a scan ASAP the lady that did it hurt me bad when she touched the places where there was one. (Not bad like don't go to a doctor, but like....getting shot at close range with a paintball that doesn't bust). I passed one through either my heart or lung, I don't know. I felt like I was having a heart attack for about 12 hours. I couldn't breathe or think too good, I hurt REALLY bad and couldn't lay down or sit back. Then it felt a little better but I coughed blood and we went to the ER (I didn't go before because I was an idiot, but when my husband SAW the blood he threw me in the car). The ER did a full body scan and said it must have been the last one because I was clear. You do not want that to happen though; I got fussed at alot for that. That's my experience. I'm not a doctor and sorry for your period situation, but I sure wouldn't suggest birth control pills. :(