Is there a natural way to abort an early pregnancy?

Hey there.
Well actually I have a few questions. I have been having unprotected sex with my boyfriend for over 8 months now and I haven't gotten pregnant in all this time, never a late period, nothing. When I mentioned it to my sister, she thought it was very weird and suggested I get a checkup to make sure everything is okay and that I actually can have children. While I'm not really afraid of getting pregnant, I still wash right after sex and make sure there isn't any semen left in me afterwards. I know it's still not too safe but I'm willing to deal with that risk. One of the things I was wondering tho is might there be something wrong with me because I still haven't gotten pregnant after all this time?
On the flip side, because I've never really had a late period in my life (unless my cycle changes due to living with other girls. Again, I don't know whether that is myth or fact) the fact that I'm over a week late this month makes me worried that I might be pregnant. While I don't really mind this, it would make things much easier if I wasn't. Is there any natural way to abort an early pregnancy? Any exercise routines, food to eat, etc....
A couple of my friends have talked about taking a high amount of Vitamin C or foods rich in it to abort or doing vigorous exercise routines daily. I don't know whether there is any truth to these myths however. I would like an expert opinion on the matter and any feedback I get would be really helpful.

Cheers!

They are MYTHS.... Plenty of athletic women continue to work out and have ehalthy pregnancies.

Look... EACH month that a woman has sex WHEN SHE IS FERTILE, she still only has a 29% chnace of becoming pregnant.

IT takes HEALTHY couples that TRY to have a baby up to a YEAR-18 months to concieve. There are only 5 days a month that you have as a window of opportunity, you are likely missing that.

IF you do not want to be pregnant, then you would need an abortion. If you do not want to get pregnant you should use birth control, as you are playing with fire.

I hope you kept your baby and that you have many days filled with laughter and happiness.