Advice please

Hey! So I am currently 17 days late for my period which is a 5 week cycle. Iv been TTC for 13 months now. 
All tests have been negative. 
Struggling to get into my doctors because of it being Christmas ect 
My next period is due the 14th 
At first I was feeling very sick and had stomach pains but these have eased off the past week
Do you think I could be pregnant or would I know by now? And shall I go doctors or wait and see what happens with my next period? 
Thank you!

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