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PCOS is multifactorial disorder which leads to anovulation
. Egg size of 18 mm and above are considered mature and pregnancy can occur if you made contact at the time of egg rupture. As u took ultrasound
test on 13th day and egg size was 17 mm, hopefully it would have reached maturity on day 14 as follicle grows 2-3 mm/day. You can confirm pregnancy by doing Urine pregnancy test after 16-18 days of contact. If you are overweight
, try to lose weight by diet control and exercise. Get your blood sugar levels done apart from other hormonal investigations. Testing blood sugar levels will give an idea about need to start metformin
All the best.