Bled after masturbating

So basically I used a massager that is like a vibrator however very strong and I orgasmed once.

However I wanted to try again.

Though I kept pushing it more and more but I would not orgasm.

Later on I began to bleed a little so I decided to put a pad on just in case.

I woke up this morning and there is a lot of blood but kind of brown ish.

My period should be starting next week as I already got it in December.

Please can you help me? Has this happened to you before?