I have never been this late!!!!!!! BFN

i have been tracking my period since I was a teenager. after having my second baby (who I lost) 3 years ago my cycle changed to 26 from a 28 days cycle and a 4 day period. this December we BD'ed as much as we can but I couldn't track and log as usual because of so many activities and travelling. I tried preseed once during my fertile window. Now I'm 3 days late and I've never been more than a few hours late my periods usually start very late in the night or very early mornings like between 10pm and 4 am ( while sleeping) which if I log when i wake up based on when i think it started makes it look like a day late or early in my log and that's it. Since 3 days all urine tests are negative and today took a blood test and its negative. I was told to come back in 2 weeks for another blood test but my nerves is getting a hold of me. Also i usually have very mild cramps but I've been cramping more than usual this month yet no AF. I've been TTC since August. please pray for me. I need words to help me hold my nerves. I need this miracle.