Hello Doc...sperm Was Poured On My Private Part On The

Hello doc...sperm was poured on my private part on the 24th of september but I use water to wash it off...I wasn't penetrated...is there any risk of pregnancy? I had unprotected sex on the 26th of september by 4:40 and the guy pre-cumed in me...he wasn't sure he released...I took sendinor2 on the 27th by 10am...i have irregular menstruation..i saw my menstruation last on the 28th of August and i'm suppose to see my menstruation on the first week of october...i've been having cramps like it wants to come out....please will it come out? Or is there any chance of pregnancy? Pls help me..i'm worried