Hello,
From your symptoms, you seem to be suffering from intermenstrual bleeding. It could be due to several causes. Firstly, you should get urine for pregnancy test done to rule out miscarriage as the cause of bleeding if you had unprotected sexual intercourse prior to that. Other causes which need to be looked into are fluctuation in hormone levels, hypothyroidism & fibroid in the uterus. It could also be due to a genital infection, cervical polyps or ectopic pregnancy. You should consult a gynecologist for the diagnosis.
I hope it helps. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
It could be possible. By the info you gave that made your cycle 26 days. And since you said it had been irregular I would not be concerned. If you don't already you may want to use the tracker that is on the site that way you can see how many days your cycle is over the next few months. It helps me when I talk to my gyn. Hope that helps