Finally found the episode (Courtesy of IF summary the EDT, August 7th, 2021)😆
So based on the calendar, it seems Dhara had taken at minimum 3 pregnancy related tests on August 1, 9, and 21. All of which were negative. This is before the Kanwar Yatra (which happened Saturday July 24th). Another hint provided by the episodes on what date it truly is in Pandya Store is their brief flashing of the full moon. In July, the full moon occurred on July 23rd (one day before true Yatra) and in August, the full moon occurred on August 22nd (one day after when they showed the negative pregnancy test). Based on the sequence of episodes, and the fact of the full moon, I'm going to assume that Kanwar Yatra was shown on the wrong date and it's truly August in the Pandya world 😆
Also, considering how Dhara took multiple pregnancy tests in a short span, I will make the assumption that she has a slightly irregular period.
The yatra happened the following day, Shiva and Raavi's split happened in a span of 2-3 days. Raavi had a mustard colored dress (when she went to the park) and now she has a pinkish purplish kurta (after changing out of her bright pink kurta). So let's assume today's Pandya date is August 24th!
So the current timeline is:
August 9th --> negative pregnancy test (covers from July 31st onwards)
August 21st --> negative pregnancy test (covers from August 11th onwards)
August 24th --> positive pregnancy test (should cover from August 14th and onward)
The hormone hCG is released from the embryo after implantation, and that's what urine and blood tests measure to determine pregnancy. Typically hCG is produced and released 6-10 days after conception. Urine pregnancy tests typically do a good job at picking up hCG levels; however, a blood test does a better job at picking up even the tracest amounts. hCG itself rapidly increases, doubling ever 48 hours!
Dhara is so early in her pregnancy that it is hard to determine whether she has any complications, ectopic pregnancies are usually determined by weeks 4-6. And other pregnancy complications require blood tests, imaging, etc... so the CVs have a chance of creating a complication should they want to 😔
August 24th positive means the conception could have happened between August 14th -- August 18th. The episodes immediately preceding the negative pregnancy test was the bedroom SR... so I think it worked out for them here.
Again, assuming Dhara had an irregular cycle because she took quite a few pregnancy tests in August, you would need to add 266 days to the predicted conception date (which in this case is between 8/14-8/18)... that brings the due date for the baby somewhere around May 7-11th should there be nothing wrong with the pregnancy
In comparison, I tried to determine Raavi's birthday. There was another full moon shown in the episode which happened on May 26th (She's a Gemini!). So, after little Tara is born, it should be Raavi's birthday soon if the CVs still remember their own track 😆