 [ Symptoms ] could i be pregnant  me and my boyfriend had unprotected sex 3 weeks ago this present week started off with cramps and gas my period has always been irregular before during and after birth control so i thought it was my cycle time cycle never came then daytime and night time nausea proceeded  it is 230 am now and i am nauseous while typing this also sensitivity to smell like sweet smells and especially bacon and i love bacon and my lower back out of the blue has been hurting for 3 days [ Disease ] yes it is safe to combine over the counter antihistamines with pain relievers such as motrin or tylenol i would suggest you consult your pharmacist to ensure you are taking the correct dose of these medications