Looking at the pictures you've uploaded, you're a Norwood 2. However, you'd need to upload a side picture so we can evaluate where your ear is in relation to your temporal recession. This will allow a proper determination of your hairline and which Norwood you're at.
Only panic when you're a Norwood 3 and you start noticing vertex thinning. That's when you need to start medicating with Finasteride and Minoxidil.