The only suggestion I have is to take a pregnancy test. This happened to me last month, and I was pregnant. I experienced a loss, unfortunately, but my doctor explained to me that what I thought was my period was actually heavy implantation bleeding. Everything you read says implantation bleeding is just light spotting, but she said it can be much heavier. It's also possible that you may not experience your temp drop until your period is almost or totally over. Good luck to you!
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