I Am A 21 Year Old Girl. I Have Recently

I am a 21 year old girl. I have recently got to know about masturbation and ended up trying it for the first time. In spite of being gentle, it was a bit painful and also slight bleeding was there. I was afraid whether something is wrong. Now my periods this month have been delayed by a month. I would also like you to know that I had been diagnosed with Anemia previously and even that time my periods were delayed by a month or so. What should I do? Is it something I should be worried about?