I don't know what to think.. Please help me!

Hey guys!

So it's kind of hard for me to be talking about this on the internet, but I really need to know if anyone else has experienced anything like this before! So on July 14th I found out I was pregnant. Couldn't have been more excited, happy, the works! Had some spotting the day I found out. I only took a test because my breasts were really sore and felt like itchy and like they were being stretched for about a week. And I was throwing up everyday. I thought I'll take a test to rule out pregnancy because this is how my periods usually started. However, everyday after the I got the BFP the spotting was more, in the morning it would be brownish throughout the day it was a not very dark but not very light pink. By the 3rd day after the BFP I had to use a liner because it wasn't only when I wiped. Long story short basically from there after it was really heavy and eventually got clotty, and within the same 7 days of finding out I was expecting, I found out I was having a m/c. Fast forward to this month. I was supposed to get my period on September 22...its the 21st and also the last day of my period. But I've been really sick for the past 4 days throwing up in the morning and really nauseous throughout the day I don't have a fever at all though! And my boyfriend said I've been acting like I'm pregnant? Basically I'm having the same symptoms as when I got the BFP in July. But I thought I just ended my period? So I googled it and found out about something called "breakthrough bleeding" which I heard is basically either bleeding in between your periods because of birth control, or just a heavier implantation bleeding after a miscarriage. ( I have no clue how much of that is true just to add in there.) So I took a test today in the middle if the day because I had to buy it on the way to work.. And got a BFN!!!? I don't know what to think because the only symptom I'm not having from last time is stretchy itchy boobs just barely sore. I'm really concerned I am pregnant and its either too early for a positive or something is wrong to where I might have miscarried again. What do you guys think?