BFP 2 weeks after period

So after a year and a half of trying, I got my BFP 4 days ago! The weird thing is, the day I tested, Glow said that was the day I was supposed to ovulate, but I picked up a test bc I just had a feeling. I just ended my period about 2 weeks ago (on October 5th).
So my question is, was that really a "period" that I had or was it implantation bleeding? It seemed like a normal period...just no cramps and I didn't feel like complete crap as I usual do...or did I possible have a miscarriage and that the pregnancy test just picked up left over hcg in my system?
Also, I feel pregnant (this would be baby # 2) sore/heavy breasts, crazy tired, very emotional (more than normal) 
Sept 3-5- Period
September 13-19- Fertile Window
October 2-5- Period
October 12-18- Fertile Window
October 15- BFP

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