Unwanted 72 is definitely helpful to avoid pregnancy out of such case, it may have mild side effects if taken on a regular basis but for once it's safe at large.
It's very unfortunate that something such sort has been caused to you. To check for forceful intercourse, you may look for vaginal swelling, distorted inner garments, seminal stains on the clothes, a different hair in the pubic region (maybe that of the culprit). I would recommend that you talk to someone about it and see if you want to press criminal charges against him. I am always available to help if you wish to speak to me discretely.