Hallo

Hi avoid in first and last 3 months, 4th 5th and 6th months are safe provided there is no complications in your pregnancy.

You can read this article as well

<span style="color:#3B5998;"><b><a href="http://app.babychakra.com/article/3742">Is It Safe To Have Sex During The Second Trimester?</a></b></span>

It's better to avoid sex in pregnancy but do confirm with your doc once. If the doc says no complications then you can do