My period started on 12/21 and ended 12/31. I had sex 1/1 and 1/2. I started spotting on 1/6-1/8. I had sex again on 1/9 and 1/10, and again on 1/23 and 1/24. On 1/24 I had some reddish discharge that was stretchy. Now I'm bleeding lightly. Should I be worried? Could I be pregnant?