I need some help!!!

For the past week I have been having severe heart burn and nausea. I haven’t really ever had heart burn so this is new to me! I have been craving dr. Pepper, which is also weird as I don’t like sodas! The past two days I have been having slight cramps. And last night in my CM was a little blood but not a lot. I have taken a digital test and it came back negative, we are going to go buy pink dye tests today. We have BD every day since December 25th and I was fertile the 25th and 26th. I’m extremely confused as this is my first time trying for a baby.

AF is supposed to show up in two days. What do you guys think is going on?