Faking a pregnancy ???

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Hey guys so I have a question. I have a friend and her husband staying with me & my husband. She's apparently 11 weeks pregnant (I'm 9 weeks) and ever since she started staying here, my husband and I both have been questioning whether or not she's actually pregnant. A few days before she told us & a few weeks before I was pregnant we all got super super drunk. For being 11 weeks, she hasn't had a single OB appointment. (I've had one and more coming soon) And... last night there was drops of thick red period-like blood on our bathroom floor, toilet, rug, and garbage can. As well as a couple bloody pads in the trash. I don't think she's miscarrying because she seems fine. She walked out like nothing was wrong. I don't know what else it could be. My theory is that she told people she was pregnant before taking a test, she just had a late-period. Her & her husband are constantly competing with me & my husband & copying us so maybe the fact that I'm pregnant has made her jealous so she continued the lie even on her period or its something else...? Idk what it could be. It's just weird. Does anyone have any ideas on what it could be? If she's faking a pregnancy (and just super bad at hiding evidence because her blood is still everywhere) or if something happened and she's just putting on a happy face (and not at the hospital like a normal person). What do you guys think???