PLS HELP!!

It’s been a month since I last had sex, I stopped the pill a week later, I had my withdrawal bleeding a few days later and it was pretty heavy. Ever since the only symptoms I’ve had is really high basal temperature, itchy breasts, and dizziness sometimes. I took a test a few days later and it came back negative, today I had some acid reflux, and I have read is a symptom. Could I still be pregnant after the heavy withdrawal bleedkng and a negative pregnancy test?