I have pcos do i need to take clomid (clomiphene) to get pregnant or i should first try without taking any medication ?

Depends: That really depends on your periods. If you have less than 4-5 periods per year, i would take clomid (clomiphene). Most likely you are never ovulating and if so figuring out when is too hard. If you have 5-10 periods per year, a fertility specialist can help you figure out if and when you are ovulating and then you can decide how to proceed. If you have >10 periods per year timing sex to ovulation is likely ok.

Need Treatment: Unless your cycles are exactly 28 days and have always been regular, i would suggest you seek treatment. We prefer Letrozole over Clomid (clomiphene) due to success and side effects. The fact that cycles are irregular even if they are only off a little (30 - 32d), the risk of miscarriage is high. This would be the reason i would recommend treatment. In addition the time to pregnancy will be shorter.