This seems like a really stupid question but one I have always wondered and haven't really had a clear answer to for ages.
I use OPKs each cycle, just the cheap strips, and it isn't uncommon for me to see two days of positives. My question is, if I have a positive during the evening but then the following day with fmu I also see a positive but OPKs then are negative after this, do I mark the second day as positive or am I just seeing the tail end of a surge and confusing my charts by putting in a second day of positive OPKs?
I have heard different things - mark it down as positive, and only mark down the first day as positive and either ignore or don't test afterwards. Which is the right thing to do?