Frustrated.

So I have 5 or 6 faint positives which were getting more visible by day slowly! I then had bloods done to confirm because I had what looked like implantation bleeding and cramps... my bloods came back negative showing 1 apparently so she said I'm not pregnant... im now 3 days late and still no sign of period but I'm having pregnancy symptoms... she said I'm having a chemical possibly but I really don't believe I am...