Same hpt, new pack, different results

Sa

Hi all,

I've been using internet cheapies since becoming pregnant, mostly for reassurance as I'm almost 7 weeks in. My first pack got progressively darker, with the test line becoming darker than the control line. Recently started using a new pack of same brand, and the test line isn't quite as dark and stays the same color as the control line. Is it normal for two different packs to provide such different results?