Chance of being pregnant?

okay so, last night me and my boyfriend were messing around (no we did not have sex) our clothes we pretty much on the whole time. we did grind against eachother alotttt. i was at his house for like 4hours. we didnt neccessarily do stuff for 4 hours tho.. but like then he started to finger me for a bit and yea then we stopped. but then later he asked me give him head and i did it literally for like 7 seconds. and when we stopped, obviously he pulled his pants up but his penis was like at the top of his pants , MAYBE showing a little bit. im not sure, his shirt was very long. but when i stood up to go fix my hair and makeup and being the horndog that he is, he came up behind and just started grinding against me. so then later when i got home, i felt wetness on the back of my jeans. im not sure if it was from me or from him..but IF it was from him, is there a chance of being pregnant?