so I am really freaking out... can anyone help??!?!?!

So me and my wife have been ttc for just a bit I'm very new to all this sorry in advance i dont know all the terminology but we both really want kids! I had my best friend/sperm doner fly down and stay with us from July 15-21st we artificially inseminated 5 times out of all the days he stayed with us (I've had a slightly irregular periods but I'm never a week late and I took a few (like 15 so far) pregnancy tests and they all came out invalid!! I checked if they were expired and none were. and I followed all instructions?? is it just too early!!?!?! I'm also spotting off and on and I have been feeling really weird lately...