Two tests two very very faint positives help!!?

Hy all well my period was due on sunday and yesterday as period still hadnt come i decided to take a pregnancy test a very very faint positive line appeared my partner could also see it it wasnt my imagination i put it down to being because i took the test at 4 pm so thought i'd try again this morning and again it was there but still sooo faint its barely there ive worked out dates and i would only be 4 weeks is this why or could it be a chemical pregnancy im soo scared want this so much so any advice and help would be very much appreciated thankyou x