Pregnancy Test Question

Ashley

About 1 week after conception I took 3 pink dye pregnancy tests about 1 day apart and they all came back negative. Then 2 weeks after conception I took a clear blue digital it came back positive 1-2 weeks. Now recently I took another clear blue digital and it came back positive 2-3 weeks.

Is there a reason why all the pink dyes came back negative? Was it too early to get a positive?