My period cycle is mostly 27 days but have been 29 and 28 and 30 it will switch up sometimes but mostly is 27 is this normal in trying to concieve ?

Sounds normal: It sounds like you are having very regular, predictable menstrual cycles since there is only couple of day variation from month to month. This is a very normal pattern.

Yes: These are considered minor variations in your cycle length and are completely normal. Assuming this pattern continues, you should be ovulating sometime between day 12 and 17 each month.