Could I be pregnant

Me and my BF been having ALOT of intercourse, never protected. My last period was from 7/31 -8/5, before and after we been very active, I bleed lightly for about 2 days around the 8/15 and 16, then more sex. According to my tracker I'm 9 days late, I even cramped for about 3 days in which there was light pink spotting only when I wiped and now for the last 3 days my breast been feeling funny and last night I noticed a clear liquid coming from my left nipple but nothing from the right. Had headaches off and on for the last week and very tired. I took a test but it said negative. Idk what to think....