Is it normal not to have any symptoms?

Alba

I missed my period last month and have once taken a home pregnancy test that came out positive. Based on my calendar, I’m 6 weeks pregnant but I’m still not sure because I the only symptom I have is that Belly feels tight. And sometimes I think even that might just be in my head. Other than that, I don’t have ANY other symptoms. I dont feel nauseous, sleepy, or tender. Is this normal??