Hi dear I had my last period on 11 December but...

Dear Customer
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What are those symptoms related to ?

although we dont have much info about your medical condition , but nausea and dizziness can be caused by alot of medical issues , but about its relation to pregnancy , if you are expecting pregnancy , you have to do the following :
1. doing home pregnancy test in the next weeks ( after 5th of Jan )
2. have plenty of rest and healthy life style such as healthy diet
3. make sure that the medications you take arent cause those side effects ( omeprazole can cause nausea )
4. if you medical condition presist or new symptoms appeared , consult an internal medicine doctor soon 

Needed medical examination :

1. physical examination
2. blood and blood chemistry tests
3. urine test
4. blood suger test 
5. liver and kidney functions tests
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Kind Regards