I used the dollar store ones with all 4 of my kiddos... And I tested the day I was supposed to start my "monthly"... And got positives! Good luck!
Dollar store ones worked just fine for me! especially if you have to test a few times if its early. If your already late and you wanna buy a good test, then clear blue and first response are good ones.
I actually spend 99 cents (from the 99 cents store lol) on my pregnancy test and it showed a faint positive 3 days before my missed period :) Good luck, just make sure to get the one that says Early pregnancy test as they tend to detect a lower hCg level than the ones you take after a missed period.
Clear blue digital.. First responss :) both good! Well I took clear blue digital and it came up 2-3 weeks.. Thats quite early