Can a pcos pregnant woman make these test lp-ir score, homa-ir,c-peptide to detect if pcos is due to insulin resistance?

Yes, they are all: blood sample tests, though C-peptide is also checked via 24 hour urine collection. Pregnancy & stage in pregnancy affect physiology & results will likely be somewhat different when not pregnant. Non pregnant results more relevant for long term health. None definitively diagnose PCOS as due to insulin resistance, yet a strong association has long been observed. Rec. study: http://goo.gl/ubDC9h.

PCOS: PCOS is not due to insulin resistance but they are often seen together. Insulin resistance means "diabetes". Is that what you have? Let me know please.