Weak Tummy Muscles? "Pulling" when turning/twisting/bending

[LunarSpoon]

Anyone else experiencing this? Just in the last two days, I've felt a "strained" sensation in my abdominal muscles when bending over, pivoting, etc. I don't have the strongest core per se, and have gained a few pounds recently (5'2", up from 112 to 115). Is this weak tummy muscles compounded by the bloating?

Would love to know if anyone else is experiencing this! Oh, I should also mention I'm only 4.5 weeks. Super bloated, sensitive to smells... that's about it!