Ovulation test for pregnancy got negative

Syeda

Help please...!!! I am 4 days late and have mild cramps since 9 dpo till my due date .it was like as if my period but is about to start.on my 4 day due I took early morning opk test as for pregnancy because I have read every where it can give you positive result before HCG test but got negative..!! .so am I not pregnant if opk is negative after missed period help please