Late period, negative test.

Destiny • |GOD Works magic✨💝|
My cycle usually last about 34 days. Im been ttc since June, after coming off of lessina bc, I've had unprotected sex with my fiance almost everyday of my cycle and I was due for my period yesterday or today and it isn't here. I took a test four days ago and it wasn't negative, I took another with dollar tree brand today and it was negative. I was pregnant once before in late 2013 and I miscarried at seven weeks , I knew right away I was pregnant and I took tested positive at my doctor the next day, so when should I test again and any other advice ? 
Please and thank you