Confused...

Merrielle • 🇵🇭🇬🇧22years young😊 mommy to 2 beautiful angels 👼 👼 miscarried in September 2018 & December 2018 TTC with PCOS

I’m 13 days late and every test I take is negative but I’m having pregnancy symptoms (very sore/sensitive boobs&nipples, pinching type of cramps, back ache, tiredness and nauseous) I’m so confused on what’s happening to my body! Would it be best to go to my doctors to have bloods done or keep testing?