Important differences between implantation and menstruation !
Implantation bleeding has a short duration. It is also light in most women. Comparing it to menstruation blood, it looks like a one time spotting occurrence. Do not confuse it with spotting. Some women experience spotting; this occurs as a series of bleeding episodes in between menstrual cycles. The difference is that spotting will happen two or more times while implantation bleeding is light bleeding that disappears after one or two days.
Note the timing too. It will most likely happen a week after intercourse or ovulation. The spotting will happen anytime after menstruation. It may occur one day then skip three, and take place again and keep skipping a day or two or even come as a several day spotting. This means that you can spot for five days and then skip a few days and start spotting again for a day or two or stop spotting until the next menstruation.
Another way to tell the difference is that menstruation blood gets heavier then subsides as days go by. Implantation bleeding is light throughout and goes diminishing as days go by.
Menstrual blood is heavier than either spotting blood or implantation bleeding. Menstrual blood is also a dark red due to exposure of the blood to the air. Fresh blood is a bright red. Spotting blood is also hued as dark red only that it is lighter than menstruation blood. Implantation bleeding will be brown or a darker color than dark red.
The feeling you may get before you start menstruating can be compared to implantation. Implantation may have mild cramping that matches the days right before menstruation. The cramping is not severe and should not intensify. If it does, see a gynecologist immediately.
Related to what does implantation bleeding look like:
And what is implantation spotting blood?