Help?

I'm a week late for my period and I've tested negative, but the test took really long to develop, I had cramps and sore boobs for almost two weeks and then some light pink spotting for a couple days, & now nothing. I've just got sore nipples, no AF. What's wrong with me :( my moms friend didn't get positives with either kid until 10 weeks, & my cousin didn't get a positive until almost 16 weeks. Could that just be my problem?