Skipped period pills

Okay ladies I'm on the pill and I only took one of the pills where my period was supposed to come on and I just started a new pack well my last period was on May 8th and according to my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> I'm 15 days late I did have some very light spotting for about 3 days, is there any chance I could be pregnant? I took a test a week ago and it was negative but now I'm just waiting to see if my period will come. Should I try another test?