Is it possible to get a false positive on these? I’ve been testing using the Clearblue advanced digital and got a blinking smiley for 3 days and then yesterday morning got the solid smiley. (And because my LH strips didn’t look so high or strong) I bought a 2nd digital tester and this morning got a low reading.
I’m really confused. My partner and I did an at home insemination yesterday and plan to do it again this evening (because of the solid smiley). Should I be concerned with the results of the 2nd test?
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No, your surge just happened really fast which is normal. Some women have to take 2 tests a day or more to catch the surge because of this. It just means you are one of them:)

Also when you start with a new test device, the first reading is always "low", because it's the first baseline reading it has for you. I bet if you tested 6 hours or 12 hours later and again after that, you'd get tge solid smiley on the new tester.
I've done the same a couple times to double check myself as well