Hello I'm 19 yrs old.. my period is always regular, my first day if my last pd was on the aug 9 so I was ovulationg in the 23 I had sexual relations during my 5 fertile days, and I am 3 weeks late in my period and my next period should be coming up.. I had 5 home pragnacy test and there negative , today I took a blood test but I don't know how to read them can you please help I have a picture o it..