Aw, yan talaga ang common sa pregnancy, lalo na around this stage kasi ang hormones mo ay nag-adjust pa lang, pero if masakit talaga and pakirot pakiramdam, better check with your OB agad ha, one of my mum friends naman nag-experience ng same thing at sabi ng doc niya, it was just hormonal changes, pero important lang na ma-rule out kung may iba pang issue. In the meantime, try wearing a comfortable, supportive bra (walang wire, soft lang) at mag-warm compress rin, sobrang sulit yun para sa pain, pero definitely see your doctor para sure.