Not sure if I’m pregnant.

I inseminated 2 weeks and 3 days ago. I started bleeding on the day I was supposed to start my period but it was very light pink color. It’s been 3 days I’m barley bleeding anymore and it’s a brown color. I don’t normally have irregular periods especially not ones that last only 3 days. I’ve taken 5 pregnancy tests and they’ve all come back negative but I have this weird feeling I could still be pregnant. Any suggestions???