So early today I thought AF was here because I had what looked like my period it wasnt very much and it was pinkish mostly and a stringy clot dark reddish brown of but how theres nothing at all now my cm is watery like I was having period type cramps fir about 5 ish days and a few days ago I had a very light pink discharge I dont cramp unless I'm on my period it was all on my left side and in my lower back and I normally dont spot in between periods either my app says I'm 4 days late and I'm about 18 dpo I took a test Saturday and it was negative I was going to give it a few more days before it test what could it be ?