What could this be?

I am 5 weeks along. Went to the doctor, did blood and urine test and even did a vaginal scan. Doctor said it’s too early to detect anything on the screen so ask to come back soon to do another blood test and scan. Now I’m experiencing bleeding. It started yesterday and it got heavier today. I’m not sure what is going on. Cos everything now - bleeding, headache, cramps - all seems to be like menses to me. What could this be?#pleasehelp