We had been trying for quite a few months with no success and my GP sent me to an OB/GYN who sent me for an ultrasound to check that everything was O.K. At that ultrasound the lady doing it told me that i had an egg ready on my right side. She told me the measurement and I knew that I should ovulate within the next two days. We had been DTD for a couple of days before that appointment but after she told me that info we just kept on doing it and that's when we got our BFP.