Staying at home while pregnant tips.. Please

Kari
I have a 2 year old, a 4 month old, and I'm currently about 7 weeks pregnant. I have my son every other week because his father and I agreed to 50/50. My now husband has asked me to stay home with our kids(he has 2 girls that are 11 & 5 which we have every other weekend. My 4 month old daughter is the easiest baby ever!!! So I have decided to be a stay at home mom but I find myself incredibly bored!!!!! My husband is at work all day and I find myself getting everything done within 2 hours and then I sit on the couch for the rest of the day! Please help. Any advice, tips, suggestions welcome! I'm going to go crazy!!!