No period, two BFN... Very confused!

I had my last period on dec 5th 2013. Have Had irregular periods 2 years ago but after medication have been regular 34-36 days since last one year or more. Haven't got delayed more than 37 days ever! Now two BFN with lot of symptoms. No sign of period. Think of going for a blood test after a week. Any help from people with similar situations? Ps- in last 15 tears have missed period once in 2005 skipped one month. I am 28 yrs old and have been really really ttc for past 8 months.