Is Pregnancy Possible Through Oral Sex?

My boyfriend fingered me and I gave him a blow job and hand job about a month

and a half ago. I have not had a period, but I spotted. I am freaking out and I

am worrying about it and I am completely stressed about it. I have IBS-C and

many people have told me that the medications I am on will and the severity of

it will cause fluxuations in my menstal cycle, and I have never had a regular

cycle (but I have never skipped one). I have also had a verys trenous summer

schedule and only been home one week and my schedules keep changing and I have

had major emotional fluxuations. I am very scared and I dont know what to do. I

have taken 4 pregnancy tests and they have all been negative but I am wondering

if there is still any way that I could be pregnant.. HELP!