I had unprotected sex 3 days after starting Loestrin 24 Fe birth control. My partner pulled out in time but wasn't sure if he had cum inside me, so i took plan b one step 4 hrs after the accident just in case. This was about 5 days before expected ovulation. I haven't had any pregnancy symptoms except for moderately heavy brown spotting (which i assume is because this is the first month on birth control). i am still 1 week away from my period. My BBT is normal, my breasts are not tender, and i am not showing any other signs. Should i be worried about being pregnant?