Has this ever happened to you?

Rosalind • Dating my best friend! Our first baby due 8/30/15
So my cycles are all over the place but normal they fall between 23-28 days,.. Today is the end if cycle day 30 and DF and I are convinced we are pregnant. I had a huge stomach pain on the lower left side on cycle day 18 and cramps there after. I'm having sensitivity to smells, nausea, and a heavy feeling where my uterus is. (Sounds weird when I write it out aha) everyone that talks to me lately is asking me if I'm pregnant and my fiancé is convinced that he just knows. I tested on cycle day 26 BFN and tested today cycle day 30 with anther negative... I don't want to get my hopes up to get disappointed. Should I get a blood test done? Wait it out and keep testing? How many of you guys had to wait a while past when AF was due before you got your BFP