Hey guys.. So I had my period last month (July 15th 2016) and this app says I should have started my period the 13th of august. And today its the 15th so I'm not so worried but breast still not tender ( as they usually are 2-3 weeks prior ) and say i was to have my period this month right? Well 2-3 weeks is in the late 20s of this month that will be way to long of a cycle for me .. Im not really worried just wanna get other peoples opinions . so I took a test like a few hours ago and the test came back negative . and I had unpretected sex but he "pulled out". But we continued having sex after .