Early Period

Okay, so I got my period around June 22nd and the 23rd and it lasted that week duration! Today (July 7th) I been feeling like blah and then got cramps and started to bleed! I am on birth control is this something I need to worry about and the chance of pregnancy?! A friend told me this can be implantation bleeding.....and since then I been worried and I don’t go to the doctors for another week for my yearly check up!