AF due 8/18

Autumn • My husband & I have 2 daughters & I`m currently trying to conceive our 3rd child after our first miscarriage.
Anyone else notice a weight gain? I've gained 3lb in 3 days. I wonder if maybe this is a sign I may be pregnant! I've been weighing myself every few days for a year and have everything wrote down and I'm usually around 171. Even lower at time in the upper 160's. So I'm wondering if anyone else has noticed this?