Pregnacy test advice please

[mistletoeprickles]

On Monday I had a pretty strong positive on a cheap test (off the Internet but cased ) so Tuesday I did a superdrug, negative. Yesterday used the same kind of cheap Internet one and was negative, today same brand and there's a faint positive.

I'm now 15dpo and had put the first positive down as a chemical pregnacy but now I'm just plain confused

The tests may give a positive to different HCG levels. Perhaps the first one is more sensitive at this stage, perhaps the urine for the second test wasn't concentrated enough or it could have been a chemical pregnancy but it is too early to say at this stage. I think I would go with the first/second option for now.
Just test again in the next day or two but make sure you use a urine test from first thing in the morning and use a well known test. I had an experience like this in one of my pregnancies and my baby is now 5 yrs old! Good luck.

That's good to hear grace It's very frustrating not having a straight answer. AF is officially two days late so there is a chance but positive, negative,negative, negative and faint positive doesn't give me much hope

Anyone else have any thoughts?

I agree with Gracey as pregnancy tests have ranges of sensitivity, and depending on how concentrated the HCG hormone in your wee is will also affect the reading.
The only thing to do is wait it out a few more days and retest for a definitive answer. Soon frustrating I know and these days will feel like the longest ever. But that really is the only way to know for sure.