I understand your predicament as you are full time student and now with child. Your boyfriend doesn't seem to be understanding at all or even caring.
There are several options in which you can take. You can have the child and raise him/her or even put him/her up for adoption. You may need to take a semester off in order to do so. The next option is to abort it. I don't know where you stand in pro-life v pro-choice. But do what you think is right for yourself or best choice at the moment. Seek a professional to get more information and options
I would either take some pregnancy test to make sure you are with child or see a doctor to confirm. If you are not - don't plan on getting pregnant until you are definitely ready. And I would definitely try to find a boyfriend who is genuinely interested in your health and not change his mind rapidly leaving you in the dust. If he keeps changing his mind last minute about such big things, there is no security.