BC pill questions

So I've been on the pill for about 2 weeks now. I went on it because me and my boyfriend have been together for about 6 months and were planning on having sex soon. But I have some questions about the pill. So randomly I'll have really tiny spots of red or brown on my underwear, is that normal? Also it's almost IMPOSSIBLE for me to take it the same time everyday it usualy varries from 7pm-11:30pm is it bad that I'm never taking it at the same time? I heard that it's not as effective and I really need it to be at the most effective as posible. I could take it the same time every morning and it may be easier but it hurts my stomach and I'm not sure if it's bad to just randomly switch times. Thank you!