Okay, my period is usually pretty much on time, I was suppose to get it around feb.11, it is now feb.28, I am trying to get pregnant but I took a test that week I was suppose to get my period and it was negative. So I took one today (feb.28) 2 weeks later and it is still saying negative. Could I be pregnant??

Yes; pregnancy tests aren't always accurate. I knew someone who took 4 before she got the right answer.

Positive tests usually mean pregnant, as long as the test is used and read as directed (for ex, don't read it after the prescribed waiting time)

Negatives can be due to no pregnant, and also due to low hormone levels if pregnant. Take a test first thing in the morning when urine is most concentrated. Also, blood tests are more sensitive.

That said, just because you "normally" have regular cycles does not mean you won't skip or have "abnormal" periods.

Stress, such as you might have in a relationship, can throw it off, along with diet, overall health, illness, etc...