Assu, Hi there! Congratulations on TTC (trying to concieve) Yes, it's very normal not to concieve in the first 2 months of trying.
Are you charting your tempratures? Are you using a Basal Body thermometer to take your temp, is it the same time every morning, before you get up, eat or drink? These things have been very helpful to me for charting ovulation.
As far as the frequent intercourse, for some couples it doesn't make a difference whether you have sex evernight or every othernight. Was is important is that you both don't feel burnt out about the amount of sex. If you are charting your ovulation then you will be more aware of the best timeing for sex and have a better chance. I say if your not pg after 6 months you may want to give your OB/GYN a call. Even perfectly healthy normal couples can take up to 2 years to concieve a baby. So, don't start worrying just yet