The blissful happiness may just be a "biological clock" thing. You may be emotionally ready to have a baby. I was really emotional when I first got pregnant. I didn't feel blissfully happy, just worried that something would go wrong or I was getting my hopes up. It may just be that you are getting along well with the guy and deep down want him to have a reason to stay with you, and take care of you. He seems like a good guy, I mean, he's asking you about your period and sounds concerned. You don't want to "scare him away" but he deserves to be a part of your pregnancy.The symptoms may be paranoia. I drove my husband CRAZY with my possible symptoms! Until you find out if you are pregnant, don't worry too much about telling him he may be a father. If it turns out that you are, talk to him about it. If you are close enough to have sex then, in my opinion, you should be able to talk about the consequences together. Plus not telling him and having him find out later would be way harder. If you are sure that he's the father, he deserves to know and decide whether or not he wants to be in the life of this child you created.The good news is, you shouldn't have to wait more than a month to know for sure if you are pregnant. Be sure that if you are sexually active, and not using birthcontrol, you are taking prenatal vitamins. It is important that your baby gets the nutrients it needs.Good luck!