This sounds more like implantation
bleeding. In ectopic the pain is usually more and continuous and mostly on one side either the left or the right depending upon which side the ectopic is.
I suggest that you take a pregnancy
test. If it is positive, a transvaginal ultrasound
with doppler must be done at the earliest to localize the pregnancy and rule out an ectopic as well as confirm your date of delivery.
Hope this helps. Take care and have a good day.