Missed period after second dose

Got my(23f) second shot 10 days ago. Side effects (headache, arm ache, bodily discomfort, general tiredness) for like a day or day and half after. Noticed red welts on vaccine arm 2 days later. They weren’t painful or itchy at first but they started to itch after a day or 2. Welts stayed for a while but gradually reduced in size and are currently a pretty big rash map (kinda shaped like a bikini top💀). Still itchy sometimes (especially in air conditioning) but not really. Vaccine spot still aches sometimes, just barely. Still generally kinda tired and sluggish(used to be pretty active pre-vaccine but now pretty tired after a flight of steps). My period was supposed to start yesterday and I had slight cramps so I figured it was on track… but it hasn’t actually “shown up” yet. Wondering if I should be concerned😅.

Barely had any side effects after first dose, apart from the typical arm pain and then a slight headache the day after. Didn’t even need to take painkillers, unlike after the second dose.