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What can cause a strong vaginal odor just before starting period?

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I've been having this really bad vaginal smell that gets worse right before my period. It's been going on for about 3 months. My history--I was taking Camila (progesterone only birth control) for about 5 months and never had any problems with it. After I stopped taking the pill I noticed that I would have this really odd smell coming from my vagina. It's kind of fishy smelling but I can tell it's not BV because I've had that before, and it's not a yeast infection. This smell is a little more mild. I first noticed it when my boyfriend and I were having sex, when he pulled-out, there was this semi-thick white cream on his penis and it smelled fishy. Well it was from me! Then (still after being off the pill) whenever my period came on, it would smell really metallic like. At first I thought it was the blood, b/c blood has iron in it (which still would have been odd) but now I have noticed the metallic smell right before my period. I'm not itching or anything and I don't have any STDs. What could it be? Could something serious be causing this smell (I.e Cancer)? Is it my urine? I know the best option is to always go to the doctor, but I don't have insurance right now (b/c I don't have a job) so going to the doctor is the LAST option for me.