Cost Change After Free Trial?

I’ve waited for months to be able to afford the Plus upgrade and I finally was able to pull the trigger today and when I went to upgrade I was excited to see it was offering a cost of just $43 for the whole year. That’s the cheapest I’ve ever seen! So I signed up right away but then instead of charging me, it said “your 7 day trial has begun”. Does anyone know if the $43 cost is locked in, or is it possible that 7 days from now the sale will be over and it’s going to offer or charge me the $70 or $80 annual cost I usually see?