Several faint positive then a negative this morning

Ladies...I'm worried! I'm 3 days late now and have had a few faint positive tests. Today I tested and it's clearly negative. All with FR tests. The digital said not pregnant but I know it requires more HCG levels to be positive but the FR has no 2nd line at all. Any thoughts?? Really hoping this isn't a chemical pregnancy! I was so excited to surprise my husband!!! Could it just be a mistake? 😰