Hi, I had unprotected sex the day after my period ended (25th Sept) at around 4 in the morning and he pulled out but I didn't think he fully pulled out on time. I took the morning after pill (Levonelle) later in the early afternoon about 9 hours later. Roughly 5 days later around the 30th of September I started cramping and had brown discharge which turned into a mini 3-4 day period. According to my period tracker I was supposed to ovulate 4th October and start my period 18th of October, I have a pretty regular cycle normally. However since monday 10th October I've had light cramping in my lower abdomen but it has gradually gotten heavier so I thought I'd started my period but I haven't. I had some backache a few days ago but that only lasted 1-2 days and is not really noticeable now, so I'm not sure if I just slept funny. I am also very constipated and feel gassy. Could I be pregnant? I know my period isn't due for a few days and plan b messes up your period but I'm really worried