Need advice

It’s been 17 days since I last had sex. I had a really strange cycle this past month and I had spotting and heavy flow all which wasn’t during the time I was supposed to get my period. My doctor thinks I might have actually experienced and early period. I’m on the pill so she said since I had so much mid cycle bleeding I probably won’t get a period during my placebo pill week like I usually do so she told me to skip the placebos. We upped my dosage and just like she said, I didn’t get my period. I’m officially 4 days late and like I said earlier, it’s been 17 days since I was last intimate. Should a pregnancy test be accurate by now. I took one this morning and it was negative. I don’t have any symptoms