i've been depressed and stressed out all day and I need someone to just look at this and give me advice. I should start from the beginning.

I have been seeing my boyfriend, sorry, fiancee (for easier typing lets call him Bob [not his name]) for over a year now and we have had intercourse several times. Never without a condom and I am on the contraceptive patch. Today he visited me after he got off work and we both wanted to. But today I did something I think I shouldnt have. I said he could finish inside me, and its my time of month, so I wasnt wearing my patch. I am kinda stressed now because I feel funny. Not sick or anything like that but below my stomach feels, I dont know how to describe it, full I guess. i'm afraid that I might get pregnant. We both want a child but agreed to wait until we were settled in. Even though he has said on multiple occasions that he would stay with me if I were to ever become pregnant, and even though I trust him completley, I'm afraid that being faced with the reality of the situation, if there is one, that he will reconsider.

I love him with all my heart, and he loves me (well he should he proposed) but I just dont know how to handle the stress anymore. I just need help as to what I should do, It was my idea to go without the condom in the first place but I still wonder if I should tell him that I am having fears of pregnancy.