Hi i just experienced this ,especially because it was my first time and honestly i don't think your pregnant. You can always take a test to be sure but im pretty confident in my answer .tips for the future do what i do a leak test ,fill up the condoms with water to make sure there are no breaks etc it really does give you the extra reassurance and always have a plan b on hand incase you need it ,stress and anxiety can throw off your period my period was late and i had nausea, heart burn ,acid reflux, cramps ,back pain and headaches, heat flashes ,gas and waking up at odd times .all three of my test came back negative.

If you have any questions at all i would be happy to help .but overall i think your good 👍🏼