Help. Chances of me conceiving ?

So my hubby got deployed. And I really want a baby.  We both do. But it's hard to be ttc with situations like this.  What do you ladies think do I have a chance of being pregnant. ? I have 27 CD . AF lasts 3 days.  Help please. Today I got a blood test done and it was negative for pregnancy. 😔💔 can someone help please don't just read and ignore.  I don't know my exact ovulation day but I feel as if it happened 2-3 days ago