Help 10 days late !!

I took a pregnancy test at home 7 days after having sex , 3 came out with fade lines and I’ll show yall !! So day 9 I went to the doctor and had a blood test for hcg levels and it came bck as <5 so negative. Felt happy !! And then on day 11 I had another blood test came bck <1 so negative but I have still had symptoms, sleeping a lot , lost of appetite not eating a lot , moody && 10 DAYS LATE FOR PERIOD!! I just got off birth control last month on the 13th before having sex , and I got bck on birth control but have been sick !! Please help it’s been 18 days