Cramping and positive tests

Hey guys! So I have taken about 1,000 tests in the past three days (not literally, but a lot) one- two days before my missed period. All tests are positive. But my tummy and lower back are cramping like my period is going to come (today would be my start date) so I'm worried. I just read up about chemical pregnancy and freaked my self out so I'm scared to tell my husband bc I don't want something to go wrong. Any info or advice?