 [ Symptoms ] i just got the flu shot yesterday and my arm feels heavy fuzzy and sore especially in shoulder joint is this normal  there is also a large red lump the size of half an orange i have tried rubbing my arm in spot of shot and doing exercises with arm to try and work out soreness but it is very sore in the shoulder especially and even with my tetanus booster shot it was not this sore [ Disease ] hi when its comes to women being pregnant it can happen all sorts of ways even when on bc but if you mean an iud then it does get a bit tricky it means it must have slipped out a bit for it to happen but it is possible for a women to be pregnant and still have a period or periods even if it sounds odd i think the best thing for you would be see your doctor and get a test done there hope this helps a bit good luck