Losing my mind!!

It's almost a month and my period still HASN'T came. I know there are a million and one reasons that can cause a period to not come but it's making me stress even more that it hasn't came and I'm not pregnant. Usually me and my fiancé will have sex a day before my period to help it come a little faster, at least I think it does, and absolutely nothing this month! Last day of ovulation was June 25th. I've taken at least 2 test a week since July 2nd when I was suppose to start and absolutely nothing. I know some girls can go 50 days from their last cycle till they finally get one but my periods have never in my life been this off. I'm scared and stressed more than anything! What should I do? Please nothing negative. Really don't need that right now!