I have had these results before and still had a period and low hcg levels

I have had these results before and still had a period and low hcg levels. From 32 to 25 to 16 and back up to 30.. My period isn't due for 8 days but I'm hoping this time is the real thing. I have. A negative blood type so I have to check often. It sucks hearing your levels have dropped. At first we were not trying and I was on BC but since we've been having the positive tests we have been going along as if I am pregnant. Very confusing ride but I am so happy to have my sweetheart by my side no matter the case.