I havent used asda but have used tesco, others say they arent good but I found it worked well on the day my period was due the line was dark and appeared immediately. The cheap ones you can get off internet are usually 10 mIU and work really well, I've had a positive well before my period due, some people get positives 6days after ov as soon as implantation has occured with them. Good luck!
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Hiya i used asda ones and had great success with them. Got my long awaited BFP
xx