Ay mama, I totally understand kung gaano ka-stressful yan, a few of us actually went through something similar, and honestly it's such an emotional rollercoaster na parang lagi kang nasa false hope The thing is, kung negative na ang ultrasound at blood test, usually pretty reliable na sila especially kung done properly, so mas okay siguro na mag-consult ulit with your OB next month para ma-rule out kung ano talaga ang cause ng delay at symptoms mo like the heartbeat, nausea, and dizziness, kasi yan din pwedeng signs ng iba pang health stuff na kailangan ma-address. Marami rin sa amin na nag-turn out na just hormonal imbalance o stress-related lang, so hindi automatic pregnancy yun lagi, but definitely worth checking with your doctor para ma-peace of mind mo at ma-treat kung may underlying cause. Sending you hugs mama, I know waiting is the hardest part