Is it OK that I am not eating much in the first trimester?

I am in my 9th week of pregnancy and have been very sick with nausea and some vomiting. Recently, I have been eating just the minimal amount of food - some fruit, wheat toast, and cereal with milk, also potato chips. I am taking Flintstones (my prenatal) regularly. I am not eating as food makes me really sick and I don't have craving for anything. I figure its better to starve then puke. Is it OK to continue like this for a few more weeks, by which time the nausea will hopefully subside, or should I be forcing myself to eat, even if food makes me sick and/or throw up?