Bleeding 😩

Hi ladies, I'm just after some advice... according to this app I've just finished ovulating but all the way through I've been light bleeding I'm not due on for 11 days & im having such bad "period pains" has anyone else ever had this? I came off contraception about 8 month ago when we decided it was the right time for us to try for a baby so I'm sure it's nothing to do with that. Thanks in advance x