Thanks for posting your query.
From the information you have provided you have 
PCOS and you are keen to conceive.
I am not sure why you were prescribed , 
Adova ( anastrazole) to induce ovulation.
We normally use this drug for 
clomiphene resistant PCOS patients and not as a first line.
We need more clarification in this area.
As your periods have been irregular we need to track your follicles by 
ultrasound to time ovulation.
I am not sure why you did 
pregnancy tests now, even before missing your period.
Contact me with these details, so that I can give you better advice.
Hope this helps.
All the best, take care.