Same thoughts. She probably thinks it was jinyao's sperm since they need that birthmark to make their child a heir.
Omg, yes! That's plausible. The child will be born very soon, so I'm expecting a lot of drama to unfold. If the child is indeed Yiyi's, then that makes Rourou an older brother. A dispute between He's and the Fengs might emerge, as if the whole Rourou lineage isn't already confusing enough. HAHA
I don't think that the younger aunty knows rourou's existence, the only persons knows about him are great granpa(from the mountain) and granpa(in hospital). she only knows jinyao went to store his sperm and named it under someone's name. So she planned to have a baby using that stored sperm not knowing it was not his nephew's but yiyi's.
Plus feng's 1st aunty and her evil plans to get that wench back to feng might get in between to yiyi's and jinyao's relationship. Also lingwei warned yiyi to stay away from the fengs since they might use them for their own benefits.
Next chapters for sure will be a total mess because of the older fengs selfishness.
Chances are... She already caught a whiff of Rourou's existence or she was the one behind Yiyi's missing stored sperm.