First post on here so apologies if it's the wrong place! 
2 weeks late for period - although I have PCOS so they are quite irregular. Recently I've been able to predict them within about a week though.
Took a clear blue rapid detection test last night and no line.
Took another this morning with first urine and a VERY thin light blue line appeared, slightly off centre to where it should have been. This has since gotten stronger but is still off centre.
I know I shouldn't have but after that this morning I then got last night's out of the bin and there is a clear line on it now.
Took an asda own brand then and nothing.
Partner is suggesting I get a digital one to be sure but all the above tests were for 25mlU/ml, as is digital. Would I be better to take a digital one or try to get a 10mlU/ml? Is it likely to be accurate if I test more today or do I need to wait for first urine tomorrow?