missing period

Hello my name is Shanna. My husband and I have been trying to conceive for a few years now. About 3 years ago we unfortunately had a miscarriage. Since then my periods been pretty irregular, but I always get it, maybe a few days late. This month I was supposed to get it on the 25th and around that time I spotted very lightly. It is now the fourth and my period has yet to make an appearance. I'm very tired, my boobs are sore and I'm very bloated. I've taken multiple pregnancy test and they have all been negative. I plan on making a trip to the doctor soon. Hopefully we are pregnant. Has this happened to anyone else?