Not Sure What's Going On

I'm gonna start off by saying I have been TTC for two months now. I was 4 days late this month which is very unusual for me. I took three or four test during that time, all were negative. Which made me really sad. But when I did get what seemed like my AF, it did not look like it. It was light pink at first, then light brown the pink and light was for about a day, and then it was darkish brown for a day then kind of heavy for a day. Now it's just gone, it was light through the night kind of pink, then this morning there's no sign of it. I'm not sure what's going on cause this isn't like my period. I've never had one like this all my periods have been really heavy and then kind of stops slowly. Does anyone know what's going on? Or if they've had the same thing happened to them before?