Can I start taking the pill even if my period is super late? I'm definitely not pregnant, just under a lot of stress. I missed my period in September but got it in October. Missed it again last month and nothing yet. Prior to missing it in September, my period has generally been on time however, it was late in July and August. Spoke to my gp and she said it's most likely stress that's causing it. I got a three month supply of the pill which I'd like to start on Friday. Is that ok? Even if my period hadn't started?