Chemical pregnancy, implantation bleeding, or just af so confused?

Kathy

Last af was at the end of March/beginning of April can't remember exact date because she is not always on time. I thought she might come in between May 2nd to May 6th but never showed. Took a frer on the 6th and got a very very faint 2nd line included in pics took another 2 days later and got nothing and same on Saturday. Well around 4pm on Sunday went to use the restroom and wiped and there was a very little of brownish color on toilet paper which I thought was weird because I normally get cramps 1 to 2 days before I start and pms which I had none of but still thought maybe it was still just af showing up. I put on a pad that night and have had it on since then and what you see in the pic is all I got since Sunday. Normally by now I would be bleeding heavily red not dark brown and having to change by pad at least 2 or 3 times a day but not now. I also was having some very mild cramps on Monday and Tuesday but they have now gone away. So confused as to what this could be if anyone could give me some advice or their opinion it would be greatly appreciated!