Need help

Hi ladies. So last month I got my period may 27th lasting 4 days. My glow tells me I am supposed to get my period this month on the 25th. I started having some light bleeding and cramping on Monday. I didn't think I could be having my period already. Is this information accurate because when I look online it tells me my cycle should be 28 days which means I would have my period today. I need help because we are trying to conceive and have been