help!!

so on the 9th of December i had unprotected sex. We just the pull out method & i thought we were good. A week later i had bleeding but it seemed way too much to be implantation bleeding, but keep in mind my periods last all 7 days, & this time around it only lasted 3 days. On the 24th of december we had sex once again & used the pull out method and yesterday on the 28 i experienced small bleeding and now this morning on the 29th, its more bleeding. Should i be worried?