Period came 3 days EARLY. WTH!!

Ttc #2 for four months now. With DD, we got pregnant one the first cycle so we figured it would be easy again. I had some brown bloody mucus last night and got excited thinking it was implantation bleeding. This morning, more bloody mucus. This afternoon, red blood. Why in the world would I start so early AND have my temps going up ?! If we don’t get pregnant next cycle, we will have to wait 18 months, as we live overseas and will be in the middle of a move and starting a new job (people typically don’t hire 7 month pregnant teachers). I really did not want kids that far apart! Can implantation bleeding be like a light period? I’m on progesterone so I’m shocked my period even came!