Pregnant?

Patient: Hello I was wondering if you could help me. I came off the implant in September and my periods came back to normal in November. 6 weeks ago I had unprotected sex, but came on my period 3 weeks later. 2 weeks post my period I’ve had a day of very light pink spotting and it studdenly stopped. I took a home pregnancy test but this came back negative. Could I be pregnant and just not showing the hormone in my urine or is this very unlikely with having a period?

Symptoms: Lower abdomen pain

Doctor: