Help! Surprise baby.. freaking out

So. I had a baby 6 months ago. I’ve only had 2 periods. And they haven’t been identical to my previous cycles. So when my period is due to come I don’t think anything of it.. plus I had a rough emotional 2 weeks which also throw off your cycle… but when I got to around 13/14 days late I again was like it’s coming.. and day minute second.. over the weekend I went to a wedding and honestly don’t remember if I took out the just in case Tampon before having sex…. So now This morning I took a test because now I’m 18 days late figuring a negative but no 5 tests later ( I went out immediately and bought 7 more tests) and sure enough all 5 are positive… now I’m freaking out.. worried about the bacteria and the tampon situation and holy moly I might really be pregnant.. I don’t mind more kids but im pretty sure my husband might lose it. Not in a angry physical way at all but he’s the silent scary type.. and the idk how he’s going to take it.. he is definitely all set after our 3 we already have .. totally freaking out.. this would 100% be a surprise baby.. idk I’m totally freaking out … I needed to vent thank you if you read this far and also any advice on telling husband having surprise number 4 how to stop panicking.. I feel my BP soaring lol how did you handle a surprise pregnancy? Idk if it’s the postpartum hormones but I am a whole bag of mess lol this whole post was horrible I’m so sorry lol I told you I was panicking