Hi so I'm 13 and normally my periods are very heavy causing a lot of cramping but this is the first period I have had that is very lite like very lite at first it was just spotting and then there was only a little bit of blood that lasted about 5 days when normally it lasts for up to 9 I recently went on acne medication (antibiotics) so I'm not sure if that could be the cause I'm just a bit confused and am wondering if anyone would know what's going?

Thanks for reading:)