Maybe pregnant

So my fiancé and I have been trying to conceive for almost a year now. We have twin 3yr old boys already. I have always had pretty regular periods but this month has been very weird. I tracked my ovulation week and we were intimate throughout that week. I was due for my period 4 days ago but nothing yet. Typically I feel severe cramping a day or two before I get it..haven’t had that. I have other symptoms of periods..tenderness, nausea, fatigued..very very mild cramping in pelvic area ( also all signs off pregnancy )..I took a pregnancy test two days before my missed period and it was negative but now I’m just anxious if I could still be pregnant and the levels of hormones just weren’t strong enough yet. I’m waiting another day (5 days missed period) to take another test. I am so anxious and nervous because I have had so many negatives I’m just praying for a positive this time. I would like to know if this has happened to other people.