Is it just me or is something fishy going on here ?

girls been missing for a week ish and father posts message saying his daughter was her period so look for blood in your partner's underwear .... seems strange to me that a father would be that in sync with his daughters period ? since posting that they have been removed from the house to a safe place ! and now the police are sending sniffer dogs into the house ? seems fishy to me ! my question is how would the father know she was on her period at that exact moment ? seems funny and strange and if I was police I'd be looking more into the father tbh ? what do you guys think ?