ladies please give advice!

- I'm on the pill sprintec and take it every morning at the same time. I skipped my placebo pills last week (for the first time ever) and started a new pack of pills. It's been a week since then and I have been having constant minor cramping in my lower abdomen along with minor pain and discomfort in my legs. I also had a UTI less than 2 weeks ago but took half my antibiotics till it felt like it was gone. I am so paranoid I'm pregnant but shouldn't be since I've been very constant with my pill taking everyday. Why am I having these constant lingering pains?! (Also actively having sex every night or every other day)