Can Pregnancy occur through Oral Sex + Kissing + Precum?

Hi, I would like to ask a question & currently so paranoid. Last 23rd Dec, my BF & I had an oral sex. I gave him a BJ, he didnt cum in my mouth, but did pre-cum a little. After tht we french kissed& then he returned the favour. Is there a chance of pregnancy if the traces of precum in my mouth might transferred thru the kiss & then frm his mouth on my vagina? Im still a virgin &not sexualy active at all thats why im not on birth control. That scenario happened on my 27th day of menstrual cycle & 2 days after tht I got my period. Also, I took 3 pregnancy tests on 5th, 6th,15th Jan: all came out negative. My period is due in another 1-2 days. Please help & please dont judge me im scared. Tq.