Anyone?

We are ttc I've been trying to track ovulation since I have very irregular periods. Last month had sex 10th and 12th while it showed positive. But had a very light period 17th-21st. Since thanksgiving I am cramping like premenstrual symptoms...my nipples are sensitive, I'm tired and moody, my hair falls out more in shower, BUT every day I take a hcg test and it shows negative. I pray I am pregnant but not sure how much I am psychologically feelings symptoms or if it's real. Looking online it could have been implantation bleeding and I could be pregnant and the level of hormones are just too low to show up on test. I can't get into doctor till Dec 17th and I'm going crazy! Any advice thoughts stories to compare and help my situation ? Please!