Possibilities that I'm pregnant

Elizabeth • Mommy to a beautiful baby boy
I had sex January 30th and February 23rd both were while glow said I was ovulating, I had a weird period in February, it was light and a little longer and an odd color almost like old blood. And then I noticed that I had a lot of white/creamy almost like milk but thicker cervical mucus. Also within the last couple days I've been really nauseous with headaches Slight cramping. With Constipation and diarrhea. With heatburn for about three weeks on and off. Any suggestions. Am I pregnant or just crazy, I've also gained about 6-7 lbs maybe a little more.