Yeah, I NEVER got headaches in my 1st trimester, and hardly at all when not pregnant, but I seem to get them much more easily now that I'm in my 2nd trimester.
On the bright side, panadol usually works for me if I catch it early enough, I've learnt my lesson about 'seeing if it gets better first', the moment I know it's a headache, I'll look for drugs, otherwise it takes forever to go.
I also get headaches when I don't wear my reading glasses, this never used to happen, and if I know that's what caused the headache, I'll pop my glasses and the headache goes within 5 mins.
But if it's not glasses related, I'll take panadol

Hope you find a way to manage the headaches!
And if they continue, talk to your dr, it could be pregnancy, it could be anything...who knows, you might need glasses!

Oh yeah, just remembered reading that drinking enough water can help prevent headaches too.