6 weeks not FMU

According to the first day of my last period, Oct. 13, I would be around 6 weeks pregnant right now. I have a 5 month old daughter and wasn’t anticipating getting pregnant again so quickly as it took us a year to conceive her. I wasn’t <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a>, Basel temp or cm so I have no real idea of when I ovulated. I took this test today because I was feeling like I did the first trimester with my daughter so the line showed up within 2 minutes. It wasn’t fmu so I’m not sure if that would affect its strength or not. I’m a little concerned that it’s too light to be 6 weeks. What do you think?