When should I test again?

I’m 9 days late for my period and I have a test(two pack) I bought yesterday. I was going to wait until I’m 14 days late to test again(this will be the third test) but I noticed that I’m gaining weight really easily. I usually weigh from 107-110 but lost weight last month and was at 102(weighed on Monday) now it’s Sunday(only six days after) and I’m at 106.5 pounds. I don’t usually gain weight easily and I have a higher chance of losing it.. I’ve only been eating small meals, more like snacks I guess except for dinner which I have normal sized meals for. Last night I also weighed myself and it was 106 on the dot so I gained .5 pounds overnight.. Could this be a sign of pregnancy? Should I test tomorrow or wait until I’m 14 days late.