Implantation bleeding or period?? TTC

So my fiancé and I have been trying to conceive our second child for the past two weeks. We had intercourse 6 times and this is the third week now and my period was supposed to start next week and two days ago I had light pink and light brown discharge then yesterday it turned darker brown but was still light. Then today it was dark brown and now it's a darker red but not heavy like a normal period it don't fill a pad either. I've never had implantation bleeding but I was wondering if this was sorry for the image only way I could show exactly what I mean.