Used plan b in June and had my June period after. Had brief unprotected sex in early July (no ejaculation). Then in mid July I had a period that was 3 days as opposed to my usual 5 but was a normal moderate flow. My period came July 17th and I usually expect my period 32-37 days after my last cause my cycle is irregular. It has now been 49 days since my last period and I have had brown spotting for the past 6 days. my hair is also falling out and I took an at home preg test which was negative. Is it possible that I'm pregnant or is my cycle just out of whack from the Plan B I took in June? Side note: I don't think my period in July was implantation bleeding cause it was red and was moderate flow for 3 days which from my research seams to be too much to be implantation.