C'mon Ladies ! Help a sister out

Okay. So my boyfriend and I have been having unprotected sex. We had sex in my fertility stage. I have had symptoms. And I've been pregnant before. But my biggest question is. Am I the only one that has experienced a light period while pregnant. I know the difference between spotting and a period. But even when I was pregnant the first time. I bleed lightly. Except this time ... I haven't cramped. Anyone went through this before? Any opinion?