A.G.
First of all yes it does matter on the type of test. For me the cheep ones say I'm not pregnant when I really am. The only ones that work for me to detect early pregnancy are the First Response test. But the second point I have is if you are still one the pill you are probably not pregnant. When I was on the pill I would sometimes have a late start on my period and then it usually only lasted for about 3 days. I also always had really light periods like so light I only needed a slim or regular size tampon for like a day or two and then the last day I would just have light spotting. If I were you I would wait a week if you still have no period buy a good test and take it.