2 periods?

Okay last month ... for some odd reason i started on June 8 , for 7 days i had my period....and then i started on the 21st of June?? So i obviously had 2 periods in 1 month ?? That lasted 7 days?? And then on July 1st i bled for 4 days ??? and then on the 20th of this month i bled for 5 days ?? Ive also missed alot of BC pills... could that be the cause of it? should i try to get back on track ?? im really worried.