What’s happing? Help

Okay so my periods come every 27 days for about 3-4 days. I use eve to track and its always right. On September 17 I started Aunt Flow she usually is here 3-4 days and then leaves but not this time she was here for 5-6 days. Then on Thursday a week after I started lightly bleeding and spotting this went on for 4 days? This has never happened to me before like ever. Me and my husband don’t use protection and have been trying for the last 9months. I’m I pregnant? Ovulation or implantation bleeding? Infection?