I forgot to take my pill and had unprotected sex.

I miss my pill often as I just forget, but always take it the next day, about 5/6 weeks ago i had unprotected sex after forgetting to take a pill, a week after I took a pregnancy test, but it was negative. I haven't been thinking I'm pregnant, so I don't think my mind will of been tricking me into thinking I have symptoms. But recently I've noticed I've gotten bigger around the waist and my belly seems to be rounding a little, not a lot, but you can tell, my breasts are also growing only a little bit but me and my partner have noticed. I had some kind of infection a couple of weeks ago which the doctor diagnosed as thrush, he didn't test me or anything I think he just knew the symptoms, so I took 4 tablets in a day which he said would clear it up, it did a little bit, but I still feel wierd down there when I urinate and my urine has a very strong and not a very nice smell too it, also around this time I was due on my period, and had a brown thickish discharge, which I presumed was my period, but when I think about it I had no cramps or the usual stff I get when I'm on my period, and I'm always heavy. I'm also feeling very sick everyday for a while, so i haven't been eating as much as I used to, but I've noticed I'm putting on weight, on a few pounds at a time. I'm very worried, can anyone help?