I used both and they were fine. The OPK's seemed to be very senitive though- I got 2 lines for about 5 days - you have to determine whether the line is the same as or darker than the control which was a bit difficult, but at least it gives you a countdown to OV. I jst made sure we BDed whenevre there was a strong line.
Got a BFP 10 days after ovulation with the pg tests
all the best
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