Pregnancy symptoms after taking levonorgestrel?

[laluna12]

I had unprotected sex on the 15th of January, 6 days into my cycle so technically I wouldn't have been ovulating. He didn't finish in me but nonetheless, I took levonorgestrel (generic brand) within 11/12 hours. Since then I've been feeling all types of pregnancy symptoms - on and off nausea, burping, lower back ache, abdominal cramping which comes and goes but funnily enough, no breast pain whatsoever, and usually my breast get really sore about a week before my period comes, I don't know whether to take that as a good sign or not? I also experienced some brown spotting about 4 days after I took the pill, could it have been implantation bleeding?
I'm now on day 33 of my cycle and no period, despite feeling like it's going to come. Is the pill causing this or could it have failed? At the time I was taking penicillin for a throat infection, could it have reduced the effectiveness?

Best thing to do is take a test. It'll give you the answer. Especially if you're already past your period date.
I do believe antibiotics lessen the affect? I'm not 100% sure though

Those sound very much like my pregnancy symptoms. Also I ovulated on day 9 of my cycle when I conceived, I thought it was much later. So CD6 is perfectly normal to be within the fertile window. Take a test!