I had all the same symptoms you've described appear at 3 weeks past ov, and also had a night of awful nausea (although this was following a car crash so I put it down to that...) but then I found an early test kit (Fortel Ultra) so thought "why not?" and tested at 3 weeks 5 days to find a definite, but VERY feint line!! If you do decide to test early, remember to use your very first pee of the day as your levels are higher then...

Good Luck!!!