17DPO IS IT OVER ??

I am currently 17/18dpo I have taken at least 4 test in the last five days but they were all BFN … so I am guessing the prediction glow gave for my ovulation was wrong or the geritol / mucinex possibly is delaying my period because usually my period would come like clock work by now & I don’t feel that stressed honestly but again who knows cause life just be lifing unfortunately I’ll take any advice or suggestions on what’s going on or if anyone experience this I feel like I had mid symptoms like nausea at times but idk what’s happening has anyone else ever had this happen to them & days later got a BFP?? or am I out this month.