Mall, congratulations and wish you a healthy and successful pregnancy inshallah. I totally agree with falafel, if ppl make these comments it is down to their environment and understanding of things, if they had a lack of knowledge and believe things to be like that, they will say things like that.
These kind of views may only b changed through education, u know how abundant old wives tales r in pakistan, this is why they believe rubbish.
Ignore this and DO NOT DWELL ON IT, focus on yourself and your happiness.