Thanks for asking for help on Healthcaremagic.
I am really sorry to hear about the assault on you. Are you still in India?
I'm aware that your priority question at this stage is whether there is any chance of pregnancy
Legally- nobody can force you to have sex. There are couple of women organization who can guide you further in this matter, if you don't want to approach police.
From the dates and facts mentioned, I would advise you:
1. To get pregnancy testing with pregnancy kit, from a reputable brand
2. See your GP/Gynecologist (Information conveyed to doctors is kept confidential)
3. There are couple of options available if it turns out that you are pregnant. Again, they need to be discussed with your Gynecologist.
I hope things get sorted out very soon.