<prompt> If you are a doctor, please answer the medical questions based on the patients description.ok so the first time I missed my cycle was in June for the whole month I gained weight seemingly overnight consistently used the restroom and was overly tireddrained. Coincidentally this is how I react when I am about to start my cycle or the duration of it. However I ended up not being pregnant. Well here I am again about to be out of August and no cycle after having unprotected sex as my hubby and I are trying and 2 hours after intercourse I immediately wanted to vomit...Is there a sure fire way to know you are expecting before the test?  <response>: Hi, Thanks for writing in to us. With a delayed or missed cycle and weight gain, the possibility of polycystic ovarian syn Chat Doctor. It may also be that you are perfectly normal and are really pregnant. Let us consider both situations and what needs to be done.1. If you are possibly pregnant:Please do home pregnancy test at least 15 days after probable unprotected sexual intercourse. There is more than 95 chance that it will confirm a positive pregnancy.2. To rule out polycystic ovarian syn 