Hi I was intimate with my boyfriend on a particular day. However, no penetration of the penis was used. Only fingers. The following day I was supposed to be on my period, however, it has been already 13 days and my period hasn t come yet. I am worried because my cycle is usually very accurate (every 28 days). On the 11th day I tried a pregnancy test (Sure Check) and the result was negative. Should I still worry? Please help!