Please Help! Confused

My boyfriend and I have been trying to get pregnant for awhile. For the past two years my periods have been pretty consistent and I could tell when I was goin to have them. In July is when things started to get weird.

I had two periods (one at the beginning and one at end of the month) for three days and usually they last for five to six. Then this month (August) I had it the 6th through the 8th. Again three days. On the 18th I started having brown blood which is very light and it lasted till the end of the 19th. I had a little bit of back pains and cramps (nothing I couldn’t handle). I took a test on the morning of the 22nd and it was negative.

Yesterday, (the 28th) I’m started to have brown blood again, also very light, with back pains and cramps that lasted for maybe a half hour. All day today (the 29th) I’ve bled dark brown, some dark red and some very light pink (spotting). Both the brown and dark red was mixed with discharge. I wore a pad for just-in-case purposes and there was just a little bit of blood on it. Maybe the size of the tip of my finger. Most of the discharge came from when I wiped. So far I haven’t got anything so I think it’s over. I did cramp for a little bit and it felt like it was in my left side. I also had some back pain. They didn’t last very long.

I’m really confused about what’s going on. I haven’t had any symptoms that I’ve notice except maybe my clothes are feeling a little tighter than normal.

Has anyone else had this problem before? If so please let me know what it lead to. Thank you.

Update:

Yesterday everything stopped and I thought it was over. Today (30th) though around 4:30 I got to the bathroom and when I wipe there’s dark red blood.

Again I have no idea what is goin on and could really use some help.