If your family is strongly against nuvvulu, it is simpler to just avoid them during the first trimester to keep the peace ghar pe. You can easily get your calcium from basic milk and curd instead of arguing with elders.
Honestly, this is just an old myth about 'heat-producing' foods. Sesame seeds are actually loaded with calcium and iron which are great for you. Just eat them in moderation and don't overcomplicate your diet.
I totally understand your fear, dear, we always want to do what is safest for our precious little babies. In our culture, elders often tell us to avoid nuvvulu in the first trimester. Just to keep your mind at peace, you can avoid them for the first few months and then eat a little bit later.
Oh, I was so terrified of eating sesame seeds because my family said they are 'hot' foods. I literally checked every ingredient list for weeks. My doctor eventually told me a small amount in food is perfectly fine, but please ask your gynac if you are still feeling anxious.
Haha, don't worry, a few sesame seeds on your burger or in your curry won't cause an earthquake! Elders do warn about 'til' being hot, but medically it's completely safe in small quantities. Just don't go eating whole boxes of laddoos!
Unless you are eating a whole kilo of til laddoos daily, a little bit of nuvvulu in your regular food is totally harmless. I ate sesame-coated buns throughout my twin pregnancy and my babies were perfectly fine. Moderation is key, don't worry!