No, Pakistan won't for a couple of reason:
1. India currently doesn't have H-bomb according to scientists in P5;
2. For the target like Pakistan, H-bomb is overkill: India's current nuclear weapons are enough to bring unaffordable damage to Pakistan;
3. Pakistan's nuclear force can bring unaffordable damage to India as well, India's next generation nuclear weapon won't change that. The only way can change the nuclear balance between 2 country is the quantity of nuclear missiles and nuclear war system. Currently, only US and Russia have the number and the operational system, Chinese is on the way of building the system. India is still years if not decades away from starting point.
4. If India start to build a H-bomb force, Indian will immediately put themselves in the target list of each one of P5. It is good news for Pakistan.
Well India has thermonuclear weapon and it has been already accepted by rest of the countries that S1 test yield calculation was in line with the announced yield .
The Mb ( body waves) where Mb = log (A/T) + B(x,h) here A and T are the amplitude and the period measured off long-period vertical component seismic recordings in nanometers and seconds and B is a distance-dependent correction term which is a complex function of depth can be more reliably calculated by Indian scientists then westerners who were using assumption coz they had no access to site which is where the discrepancy persists and Indian scientists being near and physically present to gauge the surface geology and geometry of the test area
The surface wave calculation Ms which is a given by Xa +Xb log10 Y= Mb where Xa and Xb are geology dependent variables which are specific to Indian test site and cannot be correlated with other sites.
The Mb ( Body waves) and Ms ( surface waves ) calculation shows that the yield is correct with less than 5 % error .
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2) India's post shot radioactive calculations have been submitted to Western countries for verifications and till date no one has even refuted it . thermonuclear weapons's yields are calculated by the number of reactions of D and T and the number of 14Mev neutrons used to produce that yield . The calculations of Mn, Na, Co, Sc isotopes in the aftermath.
D+T ---- He + 1n + 17.5 MeV
India's calculations yields are 50 kt +/- 5kt in the radio chemical analysis for the fusion in which more than 30 kt came from second stage . The primary stage fission yield was calculated by the total number of fissions (TF) was obtained by integrating the gamma products and the number of fission obtained and the energy from fission subtracted from total yield gives fusion yield .
3) More complex calculations have also been done to verify the yield the nature of which have not been provided due to secrecy involved
4) India is creating DARHT and ICF ( inertial confinement of fusion) facilities
I have already wrote about those facilities in this forum
ICF --http://defenceforumindia.com/forum/threads/developments-by-india-in-icf-for-future-thermonuclear-experimentation.74318/
DARHT -http://defenceforumindia.com/forum/threads/paki-darht-up-should-india-nuclear-test-again.71885/
These facilities especially ICF which is used for simulating thermonuclear reaction wouldn't have been created if India didn't have the actual weapon .
Which proves that INDIA HAS THERMONUCLEAR WEAPONS.