I'm so confused

Miriam • 33 yrs married trying for first baby
Hi all 
​It seems the more I read on the internet the more confused I become. Honest answers would be great. 
​I have an ultra sound and lots of blood tests all came back normal. 
​On sat 8th March I had some CM and then on the 9th / 10th and 11th had very positive ovukation strips. I am assuming I am now 14 DPO ? I did a pregnancy test this evening (5:30pm ish ) and it came back BFN. I don't have any symptoms at all ( besides some cramping on 12th DPO.
​I don't want to keep getting upset after seeing negative tests. What do you think and when would you re test. Appreciate any comments thanks Miriam