Is this the 4 month sleep regression?

Question

My little guy is 15 weeks old and was sleeping 6-7 hour stretches until a few weeks ago. Around 14 weeks, he started waking up more frequently and being harder to put back down. He's fussier during the day and eats more frequently day and night. 
Is this the dreaded 4 month sleep regression come early?

Answer

My daughter is 13 weeks and going through this now

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15 weeks last Sunday and we have been dealing with this all week. I’m fucking exhausted.

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My lo is 15 weeks on Saturday and has been like this all week :/ I was only getting 5 hour night stretches before and now I’m down to 2 or 3 and he just is fussy day and night

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Mine is 15 weeks tomorrow and exactly the same! 😩 The fussiness is killing me during the day

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Following - same here ! 14 weeks