Am i pregant or could be?

Took a test couple days ago, negative. But I've been having cramps, like period cramps, bad heart burn, very tired (more than normal), my breast hurt, but not to bad, and I had a little morning sickness kinda thing this morning (where I felt like I could throw up, but didn't and then it pasted as the day went on) and my stomach has this "weird" feeling. Glow told me I should take a test, but I'm nervous I'll get another negative. Help!!