PLEASE HELP NEED OPINIONS!!🤯😭

⚠️ Advanced apology for tmi⚠️ Period started on day 30 of cycle. Much lighter than usual but red blood. Filled about half a tampon every 4 hours. Which is no where normal for me. I usually have to change my tampon every 1-2 hours. At the end of the second night before I went to bed the blood came to a stop and a dark brown discharge took its place. The discharge come and goes but never enough for even a panty liner. Im currently coming to the end of the 3rd day and it’s been brown discharge every couple hours. My basal body temperature is 98.4. Me and my husband have been TTC for 7 months now and have sex everyday. Some days multiple time a a day. Could this be implantation bleeding or just aunt flow changing a bit?