I think you can experience a slot of symptoms with a second pregnancy to be honest, like personally with my second pregnancy I knew I was as I didn't have any cramping what so ever like I usually do before my period starts and I didn't break out either like I usually do, I only broke out like a week or 2 into my pregnancy and I just knew it was a girl because my symptoms were worse when I was pregnant with my son, I had really bad morning sickness even though I wasn't being sick and this started pretty much straight away to, take a test but of course don't let it get you down if it comes up negative, good luck Mama
Ah congratulations!!
You can always do an early test if you want. I started getting morning sickness at 4 weeks with my first pregnancy which was before my period would have been as I had a 5/6 week cycle