Period is late, test negative?

Has anyone had a late period and a negative pregnancy test but still been pregnant? I'm on day 34 of my cycle and took a clearblue yesterday afternoon, but it was negative. 2 days ago, I had a very light pink bit of spotting in my underwear, but nothing since. My cycle was 24 days last month, and the longest it's ever been is 32 days, I track in Flo. I'm so confused, we did have sex during my fertile windows, so pregnancy is possible. However, last time the test was positive early on so I thought I couldn't be pregnant as a test would show it, but then where the hell is my period. I feel ill, and I'm so bloated. Any feedback from others would be reassuring.