Missed Period

Hey guys! I had my period on the 13, and i had completely protected sex on the 24. He didn't ejaculate inside of me and he had a condom on the whole time.
But, i've been late on my period around 3 days now and I'm really scared I might be pregnant. I have been worrying and stressed about it for the past 2 weeks, so could that cause the delay?
Also, I've felt nauseated, abnormal heart beating, and difficulty to breath lately as well. about 2 months ago, they've tested me for anemia because these symptoms happened before too, but it tested negative. Although they did say my hemoglobin levels were low.
Sorry the the second part was off topic, but there could be a huge chance I'm pregnant or anemic? And if I am anemic, could that affect my period?

[kxtreme16]

Also, I'm not sure if it's important to mention...
But i was dealing with a yeast infection this past week, so I've been having whiteish discharge. But my mom says this has nothing to do with a missed period.