 [ Symptoms ] hi i have taken several pregnancy test all were negative and i was wondering could i be pregnant i have missed 2 periods did not have full intercourse my husband only penetrated about halfway before we changed our minds since then i have missed 2 periods and taken multiple pregnancy tests but they are all negative and i still have pms [ Disease ] most cold medications are safe to use with thyroid hormone the only ones that i would caution you about are the decongestants like pseudoephedrine and phenylephrine these could increase your heart rate and cause you to feel like you have too much thyroid hormone in your body i suggest you talk to you pharmacist before taking any over the counter cold medicine so heshe can make certain it does not interact with your medication or your condition