Chemical or can I still be pregnant?

Janelys • Puerto Rican🇵🇷 22years Old 💁🏽 Married💍 Mommy To Three Angels👼🏽👼🏽👼🏽💕 TTC My 🌈 Baby❤️

12 days late. Has 3 positive tests a few days before missed period in which one of them the line dissapeared the next day. Been testing ever since but have just been getting negatives I’m truly confused and don’t know what to think. 😕 i have no symptoms of af and been feeling super tired, hungry, with nauseas and have really bad sore breasts. I’m calling my primary doctor monday to ask for a blood test before going to my ob/gyn. I haven’t had any bleeding or anything I did some research on chemical pregnancies and it says I should have gotten my period a week after a positive test. I really don’t understand what’s going on and don’t wanna gk to the doctor to waste my time if it’s just a chemical.😔