Mid-cycle bleeding

The last two months I have been experiencing cramps on and off throughout my cycle. Last month for a full week in the middle of the month I had really bad cramping and 2 days of spotting.

The last 2 days I have been having cramps (again it's the middle if my cycle) and this morning I woke up and went to the loo and when I wiped it was bright red blood, which the bleeding and cramping has continued the whole day.

A few years ago my then gynae told me I have endometriosis but never ever told me to what extent or discussed it again. I had my baby in Feb this year and did not have any problems falling pregnant.

Do these abnormal bleeding and cramping symptoms seem like it could be the endometriosis starting up again or just normal bleeding and cramping? Any opinions please. I am not on any hormonal birth control as I had my tubes tied after my baby.