It’s highly doubtful you’d have gotten a belly from pregnancy just yet if this would’ve been your first missed period. Please don’t take this as criticism because it isn’t, but some people are so wanting to be pregnant, they actually take on physical symptoms of pregnancy including a little belly. You may very well be having a period with a pregnancy, but since in most cases, you’d be testing after a first missed period, you may have to wait another month to test. The confusion comes with the fact that you could get pregnant between now and then, so you still wouldn’t know how far along you were. If you genuinely feel in your gut that you are pregnant, go get a test at the doctor’s office. So many times, girls (including myself) spend a ton of money on those first HPTs that you could just get one blood test at the doctor’s office instead. It also saves you the nervousness of not knowing.