Hello, km0901. Thank you for writing.
We have helped you before on this subject. If there was no ejaculate released inside you (plus, you had your period) there is no realistic risk of pregnancy. Taking emergency contraception if it's not needed will cause unnecessary side effects and a change in the menstrual cycle. Which you already know from the last time. A better option is to use a condom no matter what time of the month it is. Also, it's obvious (from what you said) you were still on your period when this happened. So, I'm not why you seem to question that.