I Just Have A Quick Question. About 5 Weeks Ago

I just have a quick question. About 5 weeks ago my boyfriend stayed over the night and we were grinding/dry humping on each other when we were in our underwear. He came but he pulled away beforehand apparently and my underwear were not wet on the outside. I did get my period two weeks later and I am on the pill however sometimes I take it a couple of hours late but I do take it daily and I have never missed a pill. I was going to wait for my next period (in about 4 days) to see if it comes but I need to safely skip it as I am having surgery on a day that I would have had my period. I was just wondering if there is any chance that I could be pregnant? We are usually extremely careful about everything we do and we have never had sex.
Also, I have always wondered this, but if you give a male oral sex and he comes in your mouth and you swallow, and then you kiss him (after eating and drinking) and he gives you oral sex, can you get pregnant?

Sorry if that is a bit of an out there question, I've just always wanted to know!