Could I be pregnant? I am 15 years old and I have been on Lo Loestrin Fe (combination birth control) for about 3 months. I had unprotected sex about 3 weeks ago. I did not miss any pills recently. I normally get my period on the 4th of my placebo pills. This time I got a very light red-brown discharge on the 4th day of my placebo pills and I have had mild stomach aches and headaches. I am worried i could be pregnant. Help!!