the day I most dreaded came on the day I most loved

So this is embarrassing.

I was 12 and we were practising for the end of year six assembly and I had to go to the bathroom. The girl next to me came with me cause she had to go too. So I was sitting on the toilet and as I already knew about periods and was expecting it anyway, I looked down and saw blood everywhere. I panicked and cleaned myself up and was convinced by myself I had cut myself with toilet paper, but I put some toilet paper in my undies and went back into the hall just in case . Luckily we only had ten mins left until we could go home.When I got home I ran to the toilet too check on things and sure enough, the blood had doubled. We had horse riding lessons after school so I was smart(ish) and changed my undies and put more toilet paper in my undies. Only after horse riding class I told my mum what happened ‘i cut my self on toilet paper’ she believed me and told me to wash up and go to bed. The next day was school and so I had to tell her. I was crying and scared so my mum told my twin sister to say she got hers three weeks before (she actually did get hers. I tried school that day but was mortified someone would find out so my mum took me home. This happened in November 2014