Iam a lady,its been a week after intercourse (I used protection) which I had while having my periods and Iam having dull discomfort on the left side of my abdomen.Initially it was on the lower left side but now its moving up. sometimes I feel nothing and sometimes the discomfort exists what could be the problem?

5days before Ihad sex without protection but he did not penetrate me and the next day my periods started. my boyfriend is biga nd he tried to force penetration please advice am worried.