What Are The Chances Of Pregnancy In Women With Irregular Periods?

Hello, I am 21 and me and my boyfriend had sex last month for like five times on different dates. The last time we did it was about 3 days before my due date i.e 4th April. Now it has been 13 days and I still haven t got my period. Usually, my periods are regular but they ve been irregular for past two months due to my routine (late night studies and late mornings). I haven t undergone any pregnancy test yet since I live in a small town and talking about pregnancy tests here at this age is like a bizarre. In addition, I m currently taking some homeopathic medicine for this period problem since 4 days but haven t got any signs of it. (Haven t mentioned about the sex thing to the homeo doctor)