In the current situation, you need to clarify if you are suffering from a gastric problem or are really pregnant. You should get a blood test
done to exclude/confirm pregnancy
as urine test cannot be relied up on under these circumstances. Once clarified, further management can be accordingly planned. Please check whether the implant has been displaced in which event it can malfunction and failures do happen. Please see a specialist for further suggestions. Hope you find this information useful. Take care.