period. 18-20

so I started my period the 18th barely any blood at all, it was completely pointless to use a tampon. on the 19th it was extra heavy and had quite a few blood clots. (more than normal). then it ended the 20th just how it started... with barely any blood just a few spots through out the whole day. Also after my periods end my boobs get soft and stop hurting until a few days before my next period.. But they're still hard and hurting a little. normally my periods last 5 days.. this period was way different and I'm freaking out trying to figure out why.. any suggestions or thoughts?