Confused!

I got a few bfps early (yey!) but my period was due on Saturday, I tested again, negative, tested since then, they've all been negative. I still haven't had any cramps or bleeding, and I've started getting symptoms. I'm nauseous, I've had a break out, and my pets are becoming very protective. Oh, and I've got hiccups which I got with my last pregnancy, something to do with my asthma. Anyone ever heard of getting positives then negatives but still being pregnant if there's been no bleeding? Really confused as to what's going on. My period has never been late before :(