Can someone please explain this theory to me?

so

i’ve seen so many people say that helly is pregnant, which on its own ok, obviously helly and mark have had sex twice so that could make sense and is a possibility

but ive been seeing people say it specifically with that one promo for episode 9 of someone (probably most definitely helly) cutting the egg

idk i know that fetus’ are conceived from eggs but is that it? or are there other reasons people feel so strongly about this theory