My fertile window was from the December 9-15 and had intercourse on from December 13-24 for the most part. I wasn’t due for my period until December 28

but I had super light spotting two days early on the 26th at night for like 10 minutes.Then the 27-

29 I bled brownish red on and off, had red blood in between but didn’t last long at all. Could this have been implantation bleeding? Someone please help. I’m currently in Korea visiting my fiancé and leave tomorrow so I’ll go and had blood work done once I get back but any ideas?