which ovulation tests?

Rachel
What are the best tests? I bought boots own brand test which is a yes/no answer which tells you when you will ovulate in 24/48 hours. There was also a clear blue test which had a no/high/peak option with a smiley face. There was quite a big price difference and wondered if it was worth paying more? 
In addition I have irregular cycles and have just had an early miscarriage last week. My previous cycles were 12 weekly, how often and when would you use the ovulation tests? Thanks xx

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