Is it possible?

Is it possible to get preg on an ovulation week, have a period (which was pretty light and darker blood), and still be pregnant?? My breast have been SO sore and I was cramping quite a bit when I shouldn't have been after my last period. Not to mention random neasea and vomitting! Any advice on this would help my nerves, please! I've had two BFN and my next period is in a week I think! I'm tired of getting my hopes up! And obviously the easiest answer is just wait until this next period! But I was just curious if anyone had opinions on if it was possible!