Wondfo false negative. 7 tests!!!!

I want to share info about wondfo hpt tests. I ordered a bundle package online and got 30 ovulation tests and 20 free pregnancy tests from wondfo. Two weeks ago, (a week before my period) I felt like I might be pregnant. I took a wondfo test..negative.. I proceeded to take one test every other day totalling 7 wondfo tests. All negative. Last night on my way home from work, I had a gut feeling I should buy a first response test..and it was positive... two very clear dark lines.. anyone else have trouble with wondfo? ??