2nd handsmoke

I'm lookin for advice cos I worry so much... I'm pregnant with baby number 4 ( 28+5) and have just been out for a meal with my partner ... we bumped into one of his friend who offered us a lift home ( about 12 miles ) I don't drink or smoke or do any drugs never have.. and half way home his friend lit up a joint I was sat in bAck and immediately panicked and opened window n my partner asked mentioned about me been pregnant and he put it oh straight away ( well within 30seconds ) so I maybe breathed it in for a very short time... do I need to worry or am I over reacting ? 😭😭