Chemical??

So 4 days before my missed period i took a pregnancy test and it was positive. I was really shocked so i took another one the next day, positive. Today i am 2 days before missed period and i was feeling weird so i took another one and it was faint positive like the first day faint. I was a little nervous so waited another 3 hours and took digital and it was negative 🙁 and then another one 4 hours later and negative again. Would this be considered chemical or should i wait until my period day to actually confirm? Has this happened to anyone?