Could I still be pregnant?

Ashleigh
I'm on cycle day 28. 
This was my first round of clomid and my progesterone was 12 on day 21 so my ob said I ovulated.. 
well I was sick and ended up in the ER on Thursday night (day 25) and they tested my blood for pregnancy and it was negative. 
They did a quantitative test and it was less than 1. :( wondering if it was too early to test or not? 

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