Bfn again!! Do early pregnancy tests actually work?

Michelle • Hi iv 3 boys and would like a girl. I`m 36 now and all my friends think I`m mad. I can`t bring myself to tell mum we r ttc she will hit the roof, but I`m so broody I don`t care xxx
Soo sad and fed up, not due af for another couple of days but other people seem to get early positives, so am I out? How do people carry on each month? It's all I think about. Don't hav many symptoms dry mouth increased sense of smell and strange let down feelings from breasts. I'm so down x