I have similiar experience before. Missed period for 2 weeks and have all pregnancy symptoms. But tested negative. dont't believe home pregnancy tests so went to see a gynae and scan showed nothing. In the end found out that it's the side effects of taking blackmores conceive well supplement. It will make you nauseas and constipate. Even mess up your period. Since then i've stopped taking. Now still trying to conceive and period is still not here yet.