Confused

Cyrena • My husband and I are ttc our first child. We have been trying for a little over 2 years. I am 28 and my husband is 30 and we have been married for 5 years.
So I'm 15 days late and I tried a pregnancy test which was a BFN. I'm confused I had spotting on April 22 to 24 and really faint pink then it stopped. No sign of AF coming and I want know why. Also I took my BBT and it declined a lot. My husband wants me try another test next week. Has this happen to anyone before? Have anyone got a negative and tried later and got a BFP? trying to stay positive and hopeful but it's making me emotional. I would love feedback, thank you.