Hi, My Husband And I Have Recently Been Sexually Active

Hi, my husband and I have recently been sexually active and we only use the pill as birth control. However, I was not taking my last 4 pills thinking that they were all sugar pills until I recently found out that 2 are still active (although they are white). I have been feeling on and off nausea (every other day), I do get headaches every now and then, I have been eating a lot more than usual, however I have noticed that I am urinating at least every 10-20 minutes. When I do, I notice faint pink on my toilet paper. Could this be early signs of pregnancy?