Do you think this sounds like implantation bleeding?

My LMP was May 21st. I have no idea how low my cycle is but if its 28 days I was supposed to start on the 18th of june but if I am 30 I am suppose to start today. Well on the 18th of june I had some spotting and discharge. At first it was light red with mucus in it. Like a clear mucus. Then it turned light pink. I also had some light brown discharge in this pad I had on. Btw I also discovered a yeast infection that I have. Its not the meds cause I havent took any yet. Ummm I been extremely tired, very moody, and I been cramping here and there. That same day before I found that spotting I was have this twinging I think, but it was the right side of lower abdomen. Alot of discharge too but I got this yeast infection so not sure if its from that or what. I took a pregnancy test on the 17th it was negitive but it could have been a little too early also. If I am pregnant I would only be like 4 weeks pregnant. My aint sore at all, sometimes my get a little tingly but thats it. I havent been feeling sick or anything yet. Still haven't started my period. So what do you think?