Pregnancy/period concerns??

Hello, I had the Mirena IUD for a year, had it taken out a couple days before Christmas. My obgyn told me to use extra forms of bc for the first month of going on the bc pill. Three days before removal of the iud, hubby and I bd'd. Didn't realize I could get pregnant having the mirena removed three days after since sperm can live for days after. I ended up getting my first period on December 29th, which was light to medium flow and lasted 4-5 days. I continued the next pack of BC pills the sunday after that period. Day 28 was when I should have started my period, today is day 29 still no period. Im worried because I had a sudden increase in breast size (no tenderness), appetite has gone through the roof, and my legs from knees down have cramped constantly over the last three days. Also, the biggest reason im worried is because I did miss one pill on about day 14, but took it when I took the next days dose since that is when I realized I hadn't taken it. Can I get preggers from missing one pill even though I still took it 24 hours later? Also, could I have still had a period if I got pregnant when my mirena was removed? I have always had a very regular schedule especially while on the pill my period would come on day 28 like clockwork, now Im worried because it is day 29 and no period. I have two lovely children ages 2 and 3, was not planning on a third for a few years.