My views
The thakurs will continue their plan, but I think Kriya's bond is too strong for them to succeed.
Once the shock wears off, Krishna may want to see the doctor to find out if there are other options or get a second opinion. If this happens then I think P will have no choice but to tell him the truth. He will be upset and maybe even a little angry at P for hiding it from him. He will be realize that she did that to protect him from his family and will be amazed that she took all those taunts for him. P may ask him to not say anything to his family. I would like them to talk about it and decide to see a specialist to seek treatment.
If the family keeps taunting P and try to force him into a second marriage, he may blurt out the truth to them. They won't believe it and will continue to blame P. I want K to be the one to tell them the truth.
If meera is coming back I don't want her to have anything to do with this infertility track. I want P and K to deal with it on their own.
It could be that if the thakurs fail in their plan they might try to cause doubt in P 's mind about K being faithful to her. Which won't happen because P knows K well. She will be upset that he didn't say anything. Chandu is there to help sort out the meera issue.
I hope they don't do this because the social message would loose it's impact, but if the CV's decide to show that the results are fake
It doesn't necessarily mean Meera is responsible, it could be Menaka and here is why I think that could be a possiblity: (I am trying to look at who else would benefit if the results came back negative)
1. She wanted KN to humuliate K after he attacked him what better way then to show that he can't father a child especially being a thakur.
2. the blood test that was given by kriya has to go to a lab to determine the result, with Menaka's past who knows she may know someone that work's there and forced them to alter the results. She may not be educated, but she is clever. They went after Shakti for his family's wealth, and got the family to believe she was a decent girl. She let Shakti get drunk so he was not in his senses on their wedding night, so he didn't realize that she was not pure.
3. When P came back with the results, she really didn't look too shocked and I felt that there was a little bit of gloating in her look.
4. P taking the blame on herself Menaka still got something else that she wanted and that was to have everyone go against P. Now all the Thakurs are plotting to breakup Kriya and get P out of TN.
If Meera loves K why would she want to hurt him like this, wouldn't she do something else that would cause a misunderstanding.
If Meera comes back I would prefer her coming back in the positive rather than negative.