I had sex 2 month ago and then my periods were 5 6 days late .I had weird periods. 2 days it bled and 1 day no bleeding then again 4th day bleeding .I shall have 5 days period .after that I had no sex but my periods this time are 9 days late. I am scared I know if I hadn't have sex after the last period I can not be pregnant but was it implantation bleeding .pain was less than normal but bleeding was good enough like periods. I am scared because 9 days is too much .I started swimming too. Can swimming delay periods? I don't have any other symptoms but I am scared about why it is 9 days late .please help.