TTC baby #2

My son turned 1 today and we decided last month that we would start TTC our second child. My son has been EBF this whole year so ive only had 3 periods the whole time. My last period was last month and i am due for it tomorrow. I feel fullness in my lower stomach (like I did first pregnancy) and had random cramping for 3 or 4 days last week but other than that I dont feel pregnant nor do I feel like my period is coming. Has anyone felt a noticable difference in symptoms between pregnancy #1 and pregnancy #2? Has anyone had no symptoms and ended up being pregnant? I might test tomorrow, I'm just curious about other people's expreiences