Pregnancy

I had sex when I was on a period with no protection two weeks ago does this mean I have a bigger chance of getting pregnant

If you ovulated within those days (plus sperm can live inside you for up to 3 days... so there is a total of 6 days) Then it is likely you will become pregnant. You should always use protection if you don't want a pregnancy and you should always have a back up method.

I would say there is a good chance of you being pregnant. Your most fertile time is when you are ovulating. For most women that is day 14 of their cycle (which starts with the first day of your period.) But all women are different and this is just an average.

Now take also in consideration that you can double ovulate. (thats ovulating twice during one cycle) I am living proof of it! Since that is what causes Fraternal Twins.(twins from two separate eggs)

Sometimes you can ovulate early.
So unless you are 100% sure of when you ovulate then there isn't a way of knowing when it is more likely you will become pregnant versus when you won't. (You would have to do a series of charting for a long period of time to know your body's patterns of ovulation.)

If you do not get your period then you should get tested ASAP.