B/Feeding... Had period since birth but now none?

My son is 13 months old and My periods returned when he was 8 months old.... Since then they have come on the 2nd of every month... (for 6 months now)

This month ... nothing.
I thought they were starting I had some dark blood ( brown) Sorry tmi...
then it went... no period. I have weird pains not the usual.... When I lent over the cot to put my son to bed i lent over and it hurt putting pressure on my lower abdomen

Im paranoid i might have a cyst... I had a BT today. NOT PREGNANT.... So what is going on? anyone have any ideas....

It might just be that you tested too early after an implantation bleed, try an early HPT which might be more accurate if you are not very far along.

If negative then go and see your GP as unexplained pain and unusual bleeding are best not ignored. I would doubt breasfeeding would cause your periods to stop after 5 months.