I don't know. help!

The last few weeks(possibly more) I've been having pregnancy symptoms. But I had my period (which was also 6 days late and I also have the merina iud) I took one test 2 weeks ago and it came back negative. But I'm still having the symptoms and it confusing me. My boyfriend does cum in me everytime  cause I'm on bc, but could there be a chance my bc failed and it giving a false negative?