Could I be pregnant?

First day of last period was June 12 I had sex June 26 according to a <a href="https://play.google.com/store/apps/details?id=com.glow.android">ovulation calculator</a> it was a day before my fertile window and another app said it was my third day during fertile window 
I've been having mild cramps 
Watery/egg white discharged (tmi lol) 
Itchy nipples but not sore boobs 
Irritability 
My period is supposed to start the 10 I took a pregnancy test today (negative) was it too soon?