Early pregnancy signs?

Last week I just went to the doctor to talk to him about my significant other and I getting pregnant. However, my period is due on the 15th but I am having some crazy symptoms. I’ve been nauseous, short of breath, and some back pain. But, I have been working out so figured nothing of it. Two days ago I wiped and had some brownish red discharge and it went away. I’ve had cramping and today I have had some pinkish spotting. Not enough to cover a pad but, again when I just wipe and it has only happened twice and went away. Followed by some diarrhea (sorry tmi) I remember some of this with my daughter but, I took a test and it is negative. Just not sure what is going on